What kind of frog is he? Please help!

[Hollywood]

Hi there. I was wondering if anyone could possibly help me. I have never really been into frogs, I always thought they were cute but not for me. But my kids brought home this itty bitty little thing that I absolutlely fell in love with. They found him down by the river. Well, he was hopping around on the ground between the river and the trees which is where I come to my dilemma. I can't figure out what type of frog he is!! I believe he is a tree frog or a bullfrog but to be honest I have absolutley NO IDEA. I have pictures posted below. He is no bigger than a penny. He is thriving well in the habitat i set up for him. I have real moss from down on the river and my kids even brought him a little minnow friend who is also doing well. Our petstore here couldnt confirm what he was either and even though he is doing well now I want to make sure I have him in the right living conditions. He seems to LOVE fruit flies. (our pet store also doesnt carry pinhead crickets which proposed a problem..at first) He is dark brown and looks bumpy with very light orange spots. Long toes but so small I cant tell if they are sucker toes Can someone give me some ideas. I love watching Senor Frog. He is a happy hoppy little thing that I would love to watch grow. Thanks so much!