Help!!Please!!FEEDING MY BULLFROG!!HELP!!?

So my baby bullfrog was a tadpole and is now a complete frog and I don't know how to feed the baby bullfrog and it won't eat I think it doesn't know how to eat it, its 2 inches from head to and 3 inches to head to toe. I am trying to feed him small crickets and it just won't so how do I introduce and make the frog to eat the small crickets??