Tonguez
A suffusion of yellow
So, we don't generally refer to bears by the term Ursus unless we're discussing species in a scientific context. But we do refer to a triceratops as a triceratops because we don't have another name for it.
Well there is the Italian word Orso.

But you're right and that is kind of the point. The binominal system is modern and formulaic and that grinds against my suspension of disbelief as being neither fantastic nor "natural". Admittedly Tyranosaurus Rex has the advantage of being noth iconic and cool in it's own right but that same luxury doesn't apply to Leaellynasaurus (how do you even pronounce that?) or Apatosaur.
In a world were Behemoths do coexist with humanoids they would be given common names and just as panther just means yellow beast and bear means brown beast why not Cuernotres instead of Triceratops?