Cornufer vitiensis
The adult male frog is about 32-45 mm long from nose to rear end and the adult female frog is about 47-60 mm.  It has disks on its toes for climbing but the ones on its front feet are much larger than the ones on its back feet.  The skin on the frog's back can be any of many different colors: gray, orange, yellow, gray-green but never green.  Some have a white or yellow stripe on their backs.