Folklore monsters (6)
(Other definitions for trolls that I've seen before include "Ugly creatures in Scandinavian mythology" , "Ugly cave-dwelling creatures" , "Mythical Scandinavian dwarfs" , "Supernatural creatures of Scandinavian folklore" , "They start rows on the internet" .)
'folklore monsters' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ogres that I've seen before include "Bugbears" , "Beasts" , "Giants in fairytales" , "intimidating people" , "Giant types" .)