Im new to this.......?

well for starters are you 100% sure they are bullfrogs? it can take up to 3 years for them to mature into frogs too because of how big they are if they are bullfrogs. green frogs (rana clamitans) have tadpoles about the same size. i just answered your other post, and you made it sound like this was a school paper, not a pet thing. still sticking with what i said in the other, not to complicated to find the info you need. scientific name is going to be Rana catesbiana, that may help you find better info instead of using the common name to search. try using google scholar too. it will have more scientific info. since they are tadpoles, you will need to feed them algae and the mucky stuff you would find on the bottom of a pond, dead decaying leaf matter and stuff like that is what they eat.