Banaynaychicken
Songster
Mmm try dipping his face in the water (or using a syringe to run it along his tounge and see if he will swallow) and putting a piece of the food in his mouth just to see if he will swallow it.
His feathers may be a form of pigmentation/something or other that affects immune system. if hes all in the middle like that he must be a bit chilly, try warming him more or lowering the heat lamp?