2016 animation starring the voice talent of Anna Kendrick and Justin Timberlake (6)

I believe the answer is:

trolls

(Other definitions for trolls that I've seen before include "internet pests" , "Supernatural creatures of Scandinavian folklore" , "They start rows on the internet" , "Mythical Scandinavian cave dwellers" , "cave-dwellers" .)

I've seen this clue in The Mirror.

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