Follow given advice and read this article: Frog Forum - Pacman and Horned Frogs - Ceratophrys - Care and Breeding. Your frog need to feel secure and stress free before it starts feeding again. How long is frog from snout to vent (SVL) and what size is the new enclosure? Thank you !
He's roughly 4 1/2 inches SVL and the enclosure is still 10 gallons. I'm pretty sure he's a male because he often croaks.