Why are you people doing this to you're frogs?
Do you know for a fact he has Chytrid?
I don't think so.

Because someone with a flipping frog descides to go for athletes feet treatment,
wich obviously did not do a damn thing at all since the frog still does it.
He noticed the backlegs being a little strange.
Can't it be a frog with a trauma or born with an abnormality?

The not eating part can be anything.
Impaction, temperature etc.
Doing a heavy lamisil treatment without knowing what is wrong,
does more damage then good.
I would stop doing this until a vet examined a smear of it's skin.
I don;t know if anything is written here on how to do this?
Otherwise i can try and put it here, but i think it's easier for a native speaker.

Let's put it this way, if you're frog got infected by Chytrid for that long,
he would be towards it's end now.
Just let him rest and put in some feeders.
He might just eat when left alone.
Force feeding and that kind of **** is the last thing you should do with a frog.
It will stress them out and make it even worse.
Stress can cause all kinds of things, worms, infections etc.