Chomper - C. cranwelli

[Sylphie]

I tried to feed the little guy today. The breeder told us that he was just rubbing the pinkies on these guys mouths and after few seconds they were opening them enough to slid some of the pinky inside (and from there the instinct kicked off and they were eating themselves). I tried it today but our Chomper just froze in place... The pinky was rather big, so I'll try to give only the head in the evening, maybe it'll work.
We also gave him a little roach yesterday but he was totally uninterested in it.

Any advices what could be best to get him started on eating?

And yeah, I know that after moving they can not eat for a few days, but after talking with the breeder that claimed they should eat offhand I'm curious what I'm doing wrong... It's always stressing when new animals don't want to eat, even after all the picky reptiles we had.

Edit:
Woo-Hoo, he ate one mealworm! I know it's not the healthiest of food but we just wanted to make sure that he in fact is teached to eat by himself (and not only by partially force-feeding like in his breeder method). Since one of our beardies was scared to death by fast roaches for a long time (we now teached her that it's food) I thought that maybe this poor frog was just scared too. So now I know that he will eat, just need to teach him the same lesson our beardie girl was taking!