Our Whites tree frog (Dumpy) hasn't croaked in a couple of months. We've had him for about a year and up until then, he would croak quite verbosely on a regular basis. He also doesn't eat as voraciously as he used to. Before, he would start hunting and eating as soon as we drop crickets in his habitat, and now he doesn't even notice the crickets it seems. Is he sick? Or - i know this sounds crazy - depressed? What can we do to help him? We miss our old Dumpy!