I still hate the idea of the Dinobots combining. And I hate the name Volcanicus.
I think instead of trying for an actual combiner name, they should have just gone with something that Grimlock would have named them. Five-Bot Mashitron. Full-Force Reptillicus. Ferocious-Face Thundermus...
(Also, in fiction, it's never the same name from combination to combination.)
Slug picked the name Volcanicus specifically because Grimlock can't pronounce it.