Character Trivia

[The Might]

Well... you say it is a canonical statement... the only thing that could fit this and that came to mind is Beregond's statement to the hobbits:

Hobbit?’ said Beregond.
‘That is what we call ourselves,’ said Pippin.
‘I am glad to learn it,’ said Beregond, ‘for now I may say that strange accents do not mar fair speech, and hobbits are a fair-spoken folk.

The fact that Beregond could say that strange accents do not mar fair speech means that he had some insight into accents. Anyway, besides him I can't think of anyone else, except maybe some Elvish loremaster.