Saigonnus
Auror
The idea of different varients of dragons bassed on the elements is a bit old-school but it is good, make sure you include special features, like if it is a cold place, give the dragon thick fur, it would be different, and maybe do about naming them something other then dragons, for example, I took the concept of dragons, beefed it up in my image and named them Ravens unstead.
If they look like dragons, only with fur... why change the name? Readers already have a mental picture of what dragons look like and the presence of fur... or butterfly wings etc. will only augment that picture but not really throw it off completely. That is like calling a rabbit a smeerp, unnecessary to change the name since it looks exactly like a rabbit. Also, when I think of "ravens" I think of a black bird related to a crow, not a creature that resembles a dragon.