You are definitely confusing the word troll, "A mythical, cave-dwelling being depicted in folklore as either a giant or a dwarf, typically having a very ugly ap

You are definitely confusing the word troll, "A mythical, cave-dwelling being depicted in folklore as either a giant or a dwarf, typically having a very ugly appearance." (OED), with the word trawl: "1 an act of fishing with a trawl net or seine or 2. a thorough search". The parent comment actually mentioned trawling in his post, too, as a alternative Ars could've used.