Our little girl took a while to settle in when we changed her surroundings so I wouldn't worry too much...
How often was he taken out of the Viv before? Is he used to you? Pogo is used to us but if anyone else comes in the room or near her, she stays very still and is not comfortable because she doesn't know them.
If he's really hungry, he will catch his food...or at least try to, so I wouldn't worry too much just yet. I'm sure he'll be fine.