Hmmm...
well if you are really concerned, tear down his tank and set him up simply. Moist paper towels on the bottom of the tank, water dish with fresh, treated water and a few hide spots (potho clippings work great because they last a VERY long time unplanted, just put the roots in a water dish) This way you can keep a better eye on him and check and fecies. It also makes it easier to keep an eye on how much he is eating. Try offering smaller crickets to reduce stress and raise the temps a little. If you can, try to maintain an average temp of around 80-85 day time and 70-75 night time.
*IF* he still refuses to eat and he starts to get thin, you can try force feeding with a pair of feeding tongs. Try rubbing the food item against his lips, if he doesn't open up apply a little pressure. But only try this as a last resort.
If all esle fails, locate a local herp vet and call for advice. Some will advise you over the phone, some will want to see the frog.
If he starts eating again but still remains brown rather than green, don't worry about it. It's quite normal for a White's to be both colors.
I wish you the best of luck and hope that the lil bugger returns to normal.
-----
Heather

ellasmommie@yahoo.com