I was at the pet store yesterday getting a few crickets for Frodo, my firebelly, when I noticed a gorgeous tiny frog sitting by himself in a tiny plastic container on the counter. As soon as the girl came back I asked what he was doing there. She said some people just dropped him off there because they didn't want him anymore (she said they thought he'd get too big). When I asked her what they were going to do with him she had no answer for me and asked me if I wanted him.

Well, I love frogs too much to let some innocent baby like that get thrown away (or God knows what else they would have done with him), so I immediately volunteered to take him. They had no idea what he was, but she said the people told her they had him as a tadpole and he just got his legs. They had been feeding him "frog and tadpole pellets", which she gave me as well as small "critter keeper" tank. She filled it with about a 3/4" inch of water and put a flat rock in that provides a dry spot for him.
I added another flat rock so he has more of a dry area should he want it. He alternates between sitting in the water and hopping up on a rock.

He appears to be a fully formed frog, despite having "just sprouted his legs" and he has no evidence of a tail. He's still quite tiny however. About an inch and a half at most.

Based on his markings and my googling, he appears to be what I first suspected he was, a leopard frog (southern).

I need some help with an enclousure. Obviously he can't stay in a critter keeper. I'm thinking about getting a 10 gallon as soon as possible. Since he's so young and apparently just recently was a pollywog, what type of set up should he have? Would something like what I give my firebelly be okay (ground covered with 'jungle bark' and moistened moss with a few water bowls and plants)? Or should he be in a more aquatic environment until he gets bigger?

Also, he's still so small I have no idea what to feed him. Even the little crickets look like they could barely fit in his mouth. I dropped some pellets into his water before I left for work this morning, so when I get home I'll see if he ate any.

Any help/info/input would be appreciated!

If it'd be helpful I could take pictures of him and post them when I get home from work tonight.

Thanks for your time!