Too bad I have been away. There are times when they just don't eat but I haven't found it to be very often. Keep in mind that these frogs can go a long time without eating. Yes they will use their fat stores but it doesn't kill them on in and of it's self. When I go on holiday I have been gone two weeks at a time and they have still been fine with good filtration.

Can you check the water parameters? Is the frog swimming about? Hiding?