Good plants for deep shade in a food forest?

I have a list of things I've been looking at but wanted to know if they are as good as they sound and the best place to buy some.  Most of these are from my new goal of looking for deep shade plants that will survive in my forest area (That I'm trying to convert into a food forest, any 'idiot's guide' type books on that lol?)  Skirret is very big on my list and so are black currants since I've read they love full shade (https://practicalselfreliance.com/shade-tolerant-perennial-vegetables/).  
DOG TOOTH VIOLET- I plan on placing under my walnuts just like Kim Goodwin noted on here but IDK a good place to get them.  
SKIRRET- which seems like an amazing plant and I've read in many places that it is great in forest and heavy shade, this seems like a very obscure plant but is talked about highly from everywhere I've looked.  https://store.experimentalfarmnetwork.org/products/skirret?_pos=1&_sid=3026be12c&_ss=r (they have a pack of seeds and the reviews on here was good (only 3 people but they got what they ordered so it isn't a fraud website) so I was going to try these seeds and a perennial kale grex.  
ARROWHEAD (aka 'swamp potato'): I have seeds which I'm experimenting with and see what happens.
MAYPOP- I've heard many warnings and I'm a bit afraid to start this but are they worth it.  They provide quite a few calories, have beautiful flowers and what I planned on trying it them going up a brick wall in an area that nothing is planted.  The closest thing to them is a sunchoke patch about 20 ft away so I feel it should work.  I know someone with wild maypop or should I try a certain type?  Another question is how does this do in a food forest or sunchoke patch- would it do well or at least not damage the patch?  It says part shade but I'm very worried about unleashing it but I already have useless vines going everywhere in my forest so it wouldn't be a loss to grow an invasive vine that is at least productive.  I have lots of sunchokes popping up which is basically my 'under story' of my forest until I start getting bigger bushes (I have goji seeds, pawpaw seeds from a friend but I heard they suck at germinating so I'm looking for shoots/whatever) but even if they do grow it will take a lot of years before they take over that portion.... )

I can say something about dog tooth "violet" (trout lily) and arrowhead. They are both tasty root vegetables, for one; but their environments are very different. Trout lily prefers more mesic forests, whereas arrowhead likes somewhat open, shallow muddy marshes. Trout lily is a good plant wherever; they stabilize the soil and can stand even the shade under evergreens, but harvesting them is a terrible pain; they are buried so deeply! And I have never found a good quantity of arrowhead for eating, although I have never found the preferred Latifolia species.

Skirret also has an edible, water-dwelling relative, water parsnip.

It would be beneficial to describe what kind of environment you are talking about so that we can recommend plants.

I'm new at this so my descriptions usually suck and are too long so I delete them.  I have deep shade forest areas with 50+ ft trees, IDK how tall exactly but very big.  Then I have an outer ring with trees being newer and around 20 ft.  After looking up the definition I think a mesic forest describes it well.  I'm clearing forest space so I have a forest edge too where some gets part shade but plenty gets full sun (some places get morning and some gets afternoon and some gets evening).  
The arrowhead (sagittaria latifolia) is just an experiment in a big outdoor bathtub to hold water and if that worked I was going to join forces with others since one has a small pond (30x30ft) and another has lots of creeks and other water type resources.  I hope it produces better than what you've experienced.
I wanted to plant the trout lily in the forest but also around my walnuts (5 huge trees but almost the entire dripline is empty besides one elderberry, wild black/raspberries and a few sunchokes).  IDK much about trees and roots (yet) but would it cause any issues if I had these planted around them and dug them up.  I look at it like a workout so I don't mind digging.

I'm not sure where you are, but that sounds like a perfect habitat for ramps and some of their herbaceous associates, at least those would be growing there in my region...

- Cohoshes
- Gooseberry
- Ginseng?
- Various mushrooms? Morels and puffballs if it's deciduous (puffballs love maple)
- False Solomon's seal, vegetable
- Solomon's seal, also vegetable
- Twisted stalk next to streams. they are a little known herb with sweet red edible berries, very widespread but confined to undisturbed habitats
- Wood nettle. One of my favorite vegetables! They also like a little more moisture, and will provide greens until late summer, when they start to turn yellow.
- Toothwort. Little forest mustard
- Wild ginger
- Many spring wildflowers, like spring beauty, hepatica, Dutchman's-breeches, etc.
- Spikenard, Aralia racemosa. Tall aromatic herb also used as a vegetable, though I have yet to eat some. Prefers edges of paths though, where there is a little more sun.
- Wild sarsaparilla, Aralia nudicaulis. More shade tolerant than their relative Spikenard, a small herb/shrub growing from rhizomes. Both supposedly have edible berries; sarsaparilla's are earlier.
- Barberry will grow in deeper shade but only fruit in partial to full sun. The same with hazel.
- Hobblebush. Autumn berries, sweet and watery
- Dame's rocket. Another favorite vegetable. Maybe they would already be there?
- Partridgeberry. Prefers coniferous woods. Evergreen, edible berries, medicinal herb.

Those are the ones I can think of growing in the same forest. I am sure there are similar native plants in your region, if not the same ones... but of these, only some grow in really deep shade. The rest prefer a little dappled sunlight at least. If you have not already I recommend identifying all you can in the forests of your region and learning their uses and some ecology. At the very least it is respectful to the forests to know their gifts well.

Plants who actually do well in deep shade tend to either have large, dark leaves, like cohosh, hobblebush, nettle, wild ginger, and ginseng; are evergreen, like partridgeberry, or die back once deciduous trees leaf out, like dogtooth violet, ramps, and other spring wildflowers.

I hope you find this useful.

Edit: I forgot nannyberry! They like a little more sunlight too but grow in shade. They, and their other forest-dwelling viburnum relatives, often have tasty blue to black berries.

Along with Maieshe Ljin's list, I hope you will look into planting hostas, because they are so pretty.

For the enjoyment of you and others:

https://permies.com/t/162078/perennial-vegetables/edible-hostas

https://permies.com/t/32937/Edible-hostas

Not to resurrect an old thread, but since it was in the dailyish, folks may see it.

I didn't see ostrich fern mentioned - fiddleheads in the spring are edible and are apparently quite well loved by some.  I haven't tried them yet, but do want to add ferns to my property.

My understanding is that gooseberry is more shade-tolerant than black currant, but that may be a bit variety-specific.  My currants are in fairly full sun, only getting a bit of shade late in the day and produce well.

As noted earlier, mushrooms may like the environment.  I do want to get into attempting to grow some in time once I've further developed some µclimates on our property.  

Blackcurrants crop best in a sunny location but will also do well in light shade.
https://www.rhs.org.uk/fruit/blackcurrants/grow-your-own
It is very easy to make cuttings of black currants. They do enjoy a good mulch so that weeds do not disturb them. I have 6 that I made from cutting and they present on the south side of the house, against the wall. I didn't lose any and they each have, in their second year 15-20 stems.,[from which I could make even more cuttings... ]

You have both inspired me to buy some food forest plants. I just made a purchase of chinese artichokes, sunchoke plants, and yacon propagules.  This is something I've always wanted to do.