Food, cover, and waterare important. Crab apples are good as far as trees go. There many different types. Also, oaks, hickory, walnuts,.. and soft mast grapes, cherries,persimmons, etc.. there's a ton of other plants/nuts/fruits turkeys will eat.
Non-tree foods...chufas, roots, tubers, corn, oats,and clover.They like clover and the insects that live in clover.

As far as nesting habitat, you could create brush piles or cut some tree tops. Blackberry thickets are good too.

I've been trying to do same thing you are. I planted some crab apples and other thingslast year. I plan to plant alotmore crab apples.

Good luck to you