I have read that you use baytril for bacterial infection. It is .3ml or cc per one gallon of water. Use this water as the water in their dish and spray them often with it also. My frog sounds exactly like your friends frog. WTF, not eating at all for over a month (two wax worms) and he was sitting in his water for long periods of time. Shedding. His legs are red.
I am just not sure if it is chytrid or bacterial infection. Ugh!