If you are raising a baby snapping turtle what I suggest to feed it is lettuce, ham, and untoasted bagels. Trust me I have experience in this kind of thing and I know your baby turtle will eat all of this within the hour. :)
Baby snapping turtles are omnivores and they eat both meat and vegetable matter. In the wild they eat things such as guppies, ghost shrimp and mealworms. As they get older they enjoy snails, crayfish and goldfish among other things.