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http://msucares.com/poultry/diseases/disviral.htm could the scab be dry pox and the mouth be wet pox I have never dealt with it- so sorry I cannot advise.

http://www.poultry.msstate.edu/extension/pdf/diseases_poultry_diagnosis_symptoms.pdf scroll down to "mouth" says wet form of fowl pox for white coat over tongue and in mouth (could be wet pox)

Might want to rule out canker: http://www.thepoultrysite.com/diseaseinfo/154/trichomoniasis-canker-frounce http://www.ultimatefowl.com/wiki/index.php?title=Canker Also I agree with the others...consider gapeworm, wet avian pox, and I don't know what the diagnosis is...could be something else...