To my knowledge I have never seen mice or voles listed as a food item in any study regarding the food habits of wild turkeys. Wild turkeys do like to eat invertebrates (insects, spiders, etc) when they are available. I would not be surprised that once
in a blue moon a wild turkey might ingest a small mouse or vole in mistaking
it for some caterpillar or grub but I certainly don't think they would
actively seek them out as a prey item. You would be better off encouraging
foxes, and weasels than wild turkeys if mole and voles were a problem.