I'm starting to worry a little less, I think he's just really really shy. Sometimes I catch him sitting in one of his pools, and once I cought him sitting right next to the piece of watermelon looking at the flies. This is only when I sneak in. I think he's just extremely hesitant to move/be in the open when he senses I'm there. I read somebody else had a full grown leopard frog who was just as shy, so It's not surprising a froglet would be too... And his little tummy is still nicely robust, so I'm feeling more confident that he sneaks his flies in when I'm out or at work...