Same type of deal with my albino pac man frog when I bought him from petsmart he didn’t eat for three weeks so I had to start force feeding him crickets and night crawlers because he had gotten so skinny and malnourished. The condition he was in when I got him wasn’t the greatest but I hope that he will get healthy soon if you know anything about this pls respond and ya about your Pac-Man frog I check if the temps tire is warm enough and does he burrow a lot? Because mine tends to burrow underground