I know next to nothing about hognoses, but I do think Derek's idea is excellent.
I had a new hatchling corn who refused to eat when we got him. Everyone was recommending the deli cup thing, but it just seemed to freak him out. Finally one time I decided to put a pinkie in his hide in his regular enclosure, and that was what finally did the trick. I think for this particular snake, the transfer to the strange deli cup was doing more to stress him than the small dark enclosure was doing to help him feel secure enough to eat. Yours might be the same.