Can I grow mushrooms on 100% fir bark chips?..

I have a few bags of fir bark chips that were originally for bedding in a rescued python enclosure. The python has been adopted and now I'm wondering if I can use these chips to grow mushrooms. If so, what types of mushrooms would do best in fir bark chips?..

Very unlikely to be successful. The bark is on the tree to stop fungus from entering the tree and damaging it. There are good edible species that you could cultivate that grow on fir logs, or even fir wood chips, but the odds that a good edible mushroom will grow on bark chips only seems very remote to me. They would be useful spread out in your soil, so that eventually other fungi can eat them and make your soil full of life, but they are almost surely not a good edible. Chip in if you know of a good edible that grows on fir bark.
John S
PDX OR

Morchella elata, one of the black morels, commonly crops up in coniferous bark mulch here in the UK. Usually by accident though. You could try inoculating the chips with some morel spawn.

Morels are notoriously difficult to cultivate, but who knows? you could try.
John S
PDX OR

Thanks for the replies. I'll try the morels..