Sorry to hear you're having trouble - hope your froggy will be Ok. Try putting a dark cloth/paper over three sides of the tank for a little while. often new frogs that are having trouble adjusting just need that extra security. Plus, it helps them feel like they are well hidden and its ok to start hunting. I know you mentioned you have part covered, i couldn't figure out how much you meant. Some of my ruby eyed tree frogs will only eat when it is pitch black - i suppose you could try that
also, Ive found that with pickier frogs, the bowl feeding method can really stress them out. maybe try just putting food into his terrarium for a little while until you know he has gotten a good meal. Some pet stores carry an appetite stimulant as well that you could try. I haven't used those before, so I would do some research about it first.
good luck