I have two peacock/big eyed tree frogs and they were both very healthy and active. Then all of a sudden I didn't see one of them for a few days. I looked all in the plants and everywhere he could be but he wasn't hiding in anything, so I figured he must be in the substrate (there was no way he could have gotten out). Then finally last night he came out but he just perched on the water bowl and he kept making weird movements like he was trying to wipe something off of him with his arms/legs. I misted him with water but that didn't help. It looked like there was something on his side but I couldn't tell if it was an infection or something just stuck there. He wasn't being active at all. I let him be, and when I looked for him this morning it was evident that he was back hiding in the substrate.

I guess my first question is do these frogs hibernate? And then given everything else I have described, what could be his issue?