I ended up coming along this link on Youtube of some extra feature in the How to Train Your Dragon dvd. It actually has some drawings and 3d models of dragons that weren't i the movie, including the whispering death dragon. I was really sad to not see that guy pop up in the movie after they showed the sick drawing of the beastie in the dragon book.
Anyway, it got me in the mood to rework a sketch of the Monstous Nightmare dragon. Did it a while back while resting at a convention.