Can a grapevine make a good ground cover?

I can't find anything online about it, as it's just so common to grow grapevines vertically.

I don't know if the vines I have are ornamental or fruit-bearing but I feel it's probably ornamental. I thought of planting some to just sprawl along he ground as a ground over in summer and mulch producer in winter.

Good idea? I'm also planting sweet potato as a ground cover but as it's a cold winter here at the moment I don't know if it'll develop roots.

It's quite possible but it's not going to grow as profusely as something like squash, and the grapes (if you want them) are not going to do well in proximity to the ground.

Like Steve says, it is possible but not really practical for mulching or use as a ground cover since they will not grow thickly enough to shade out other plants.
Add to that the very close spacing you would have to use and you rapidly have no sparse root area to grow food plants.

I have an area that is wild grape vines and around 10 species of native grasses grow up through them every year.
One other thing about grape vines, they are natural climbers, when they reach anything vertical like a tree, shrub, fence, wall, they are going to climb up it (that is the function of the tendrils that grow opposite the leaves).

As Redhawk said they are climbers, they don't creep much. The other issue is that most varieties are suspectible to diseases, and it is harder to keep them healthy when in contact with soil. Older varieties,  the ones mainly used for its leaves (we use it to make special type of dish called "yaprak sarma/stuffed wine leaves") are more disease resistant but problem still lingers.
The perfect candidate for that job is european honeysuckle. It is highly invasive for folks in the US, but it is my "go to guy" for such jobs. Old world rocks :)
Here is the link for yaprak sarma: https://ozlemsturkishtable.com/2010/08/grapevine-leaves-stuffed-with-aromatic-rice-vegetarian-and-with-rice-and-ground-meat-zeytinyagli-ve-etli-sarma/

(I will edit to embed the link, couldn't figıre out how to do on mobile)