Because when he first sees him, he doesn't think he has teeth
A toothless mammal begging with an A is an Anteater/ Aardvark
Toothless
nobody knows
edentata
toothless
Plankton
His dragon is called Toothless and there are several others mentioned in the books/film, but Toothless is Hiccup's only dragon in both.
Toothless
Cill Mhantáin, which means the "Church of the Toothless One".
a toothless watchdog is called Mohammod
Toothless George was born in 1975.
Toothless mammals are called 'edentate'.