It’s been done.
As if you need more evidence of How My Mind Works: I decided something needs to be named Doomsday Tongue then remembered that there already was Deathtöngue. Too close. Oh well.
Then then I check Google and find Doomsday Tongue Tattoo and, thus, argh! Even less original!
(You don’t want to know how I started these thoughts. Really you don’t.)