most likely, the frog is just acclimating to it's new environment. frogs are just like people in the respect that some handle a move to a new environment better than others. it's very common for a white's (also retf's) to not feed for a couple weeks after coming home from the store. i had some that ate right away, but a couple held off feeding for a few weeks. just offer it one or two crickets in a day or so. no worries, he won't starve to death if he doesn't eat right away. they are tough creatures and can go longer than you think without eating.