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The fire would have come from the two chemicals that encounter each other in a dragon's mouth or somewhere, but why wouldn't that burn their tongue?
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did you ever see "Reign of Fire"?
Probobly not. Didn't do so well at the box office.
It was about a young boy who's father died (I think) and mother is a miner. One day the miners discover a giant egg, it hatches, and a dragon comes out, and kills all the miners.
More eggs are found and soon all of humanity is nearly wiped out by oncoming waves of Dragons, and the boy grows up, and is determined to avenge his mother's death and destroy the dragons.
Anyway, to the point, the system of fire breathing that they had, was there were two glands OUTSIDE the mouth, the would squirt some kind of flammable liquid, and the dragon's breath would light it aflame.
The humans used this to defeat the dragons at the end. (Shoot them in the head, liquid burns, head explodes)
and no, I don't think they ever existed besides in myth and fairy tales.