Communicating with vikings — humans, apparently, no, vikings just sounds better — is a complicated business. He and Hiccup tend to simply understand each other, but then, Hiccup had named him; they hadn't had to play this game. Dragons have no use for names, themselves.

Toothless looks mildly demoralized by the suggestion of Gummy, but then immediately brightens when No-Teeth comes along. It's close! How does he get that across?

He perks up both ears, eyes widening, and nods his head a few times, hoping it will do the job.