The picture show a pretty good looking frog. Are you finding any poop in his/her home?
Try bringing humidity up a little and let temps drop at night to about 70 degrees.
I would also try the cricket bowl feeding method so s/he can hunt them. Heres a link to info on using the cricket bowl,
http://www.frogforum.net/vivarium-te...owl-trick.html
Let us know how things are doing too.
Also pics of the viv would help others attempt to help.