Here are tons of ideas: http://allrecipes.com/recipes/everyday-cooking/pet-food/pet-treats/
Just be careful…I’d try to avoid sugar/wheat, as those aren’t very good for a growing puppy, but it’d be easy to substitute or omit unnessecary ingredients.
Here are some wheat free ideas: http://www.crazycrumb.com/wheat-free-dog-treat-recipes.html
You can also just cut up chunks of meats, veggies, fruit, etc. And pop them in a dehydrator or oven. One I would like to try are sweet potato strips. You bake them until they’re chewy. Mmmmmm! Most dogs love sweet potatoes too.
