New and need some advice for my Pacman

[DaddyJ]

Recently I gave my oldest son (he's 9) a pet that he could take care of for his birthday. (His younger brother of 8 previously decided the cat and dog were his ) He shares my interest in reptiles and amphibians so we decided on a pacman frog for his first pet. Raising the frog is a father son project for the two of us to learn together. We began feeding Hoppity, as my son named him, crickets which we simply put into the tank with him(her?) and let the frog eat them as they came close enough. we would feed anywhere from 3 to 5 small crickets twice a day since the frog is still fairly young. after a week of this my son wanted to try different foods for the frog, so after a bit of research and several videos on youtube we decided to try it on feeder fish, super worms, and a pinkie mouse. I placed the frog into a smaller container and used tongs to give it the first feeder. it ate that one after about 5 minutes. we could not get the frog to eat anything else form the tongs and don't know why. We would love any advice for feeding this way anyone can offer. Here is Hoppity's first pic after coming home. Any clue as to species? we think its a C. Cranwelli