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pic of his tank-FOT62B0_zpswstj4mox.jpg Photo by Dustyn_Batdorf | Photobucket

pic of him when i first got him-FOT149F_zpsmbxs8yqd.jpg Photo by Dustyn_Batdorf | Photobucket

pic of him now-FOTAAA7_zpsrl7iiggj.jpg Photo by Dustyn_Batdorf | Photobucket

The only thing I see that could be fixed in his tank would be to cover the sides so he feels a bit more secure. I'm not sure what's going on with your frog, but I'm not a pacman expert so someone else will likely know more. My first thought is just that he's stressed from the changes in tanks, or it could be a matter of the food you're offering. Did you offer him the same thing he'd been eating before you got him?