My frog only eats at night also. Here is what I do to spike his appetite. .. First I turn out all the lights for a littlewhile. Then I spike the humidity up with a good misting/fogging. Give it a few more minutes then my frog will dig himself up and be ready to eat. That was how I was able to get him to tong feed dusted nightcrawlers. Make sure you are as quiet as possible while getting the worms ready so you don't startle your frog. From what I understand this is normal pacman frog behavior. At least for C. Cranwellis. Also I recommend reading some of the old forums here. I learned how to take care of my frog mostly from other peoples expieriences on these same forums.