Whereas most of my pets were WC (Hyla cinerea, Hyla chrysoscelis, Anaxyrus fowleri, Anaxyrus americanus and other species) or were just rescues (Pogona vitticeps, Notophalmus viridecens, and Taricha granulosa) so I have lots of experience with this. Look for a smaller enclosure or tub, and wrap towels around three sides so it can see you/you can feed it, and do the steps I previously listed. Trust me, unless you automate feeding (Which is another possibility) that's pretty much the only way the little guy/gal will eat in front of you. Could also be because its winter, how deep are you in winter, it may be sensing the seasons change