I went to Petsmart today to get some crickets because the place I usually go to was out. When I went to look at the reptiles/amphibians, I noticed this sad looking Chubby Frog sitting alone in an unmarked cage. He was grossly thin, and without any water. I had to get him because I was scared he'd die if someone didn't try to save him, and I have such a weakness for amphibians.

What is a good setup for these guys? I want to do the best I can to give him a good home. What substrates should I use? Thanks in advance