troll BrE AmE trɒl trəʊl AmE troʊl —In British English both pronunciations shown appear to be in use for all the various meanings (both noun and verb) of the word.
▷ trolled trɒld trəʊld AmE troʊld
▷ trolling ˈtrɒl ɪŋ ˈtrəʊl- AmE ˈtroʊl ɪŋ
▷ trolls trɒlz trəʊlz AmE troʊlz