What do i feed my baby bullfrog?

I was upstate this weekend with my friend and this baby bull frog (It still has a bit of a tail) jumped on me and wouldn't get off. I took him home with me but i haven't fed him. he seems fine but i don't want him to die. What should i feed him... My friend's mom said Algae but he has fresh water and it may take a while for it to turn green and by the time it does... he may be dead... Help.. & i would appretiate it if you dont call me irresponsible. thanks