Welcome! It looks like he has a tail shed coming on. Look for the skin to look gray/dull/waxy and then crack and come loose with nice new skin underneath. He may get itchy and rub up against stuff and be moody or lose appetite during the shed but should be active and eating soon after.
He has certainly been moody! I’m not sure if that’s a result of him still adjusting or the shed coming on or both! My only challenges so far getting him to eat his greens and getting him used to being held.
Probably a bit of both. Be patient with the greens and the handling. That can take some time for them to get used to. At his age it's common for him to ignore veges in favor of bugs. He needs the protein to support his growth spurts. Just keep making it available as an option so it's familiar. He will switch to mostly veges as his growth slows down usually between 12-18 months or so.