Redfrogcrab
Troubadour
I actually like this, wyverns are theoretically feasible dragons that are also true reptiles, using the current understanding of Evolution and taxonomyIt is only with the advent of the modern fantasy genre that wyverns were considered distinct from dragons. A silly development that has penetrated the minds of fantasy fans but isn't reflected in history.
Dragons are a distinct class of land vertebrates in my mind, coming from ancestors with 6 limbs instead of tetrapod 4 limbs
Wyverns are just big lizards whose forelimbs became wings (like birds and the now-extinct pterosaurs)