Oh, he is very intelligent. He understands perfectly--he just seems to have some trouble wrapping his mouth around words himself. It is a common issue with those learning another language, much less how to speak at all. I still mix words up myself.
[She'd understand, if she knew what Hiccup was thinking. Right now she's just trying to think of the best way to get Toothless to Hiccup, or vice-versa. They're in Goldenrod, after all--it's a long trip.]
[video]
[She'd understand, if she knew what Hiccup was thinking. Right now she's just trying to think of the best way to get Toothless to Hiccup, or vice-versa. They're in Goldenrod, after all--it's a long trip.]