And when, new players come into D&D and hear troll, most are not thinking Poul Anderson's version which is the basis for the D&D troll. They hear the world troll and are probably are thinking of the troll in "Billy Goats Gruff", the war troll from The Lord of the Rings movie, or the trolls The Hobbit movie which are completely different from Poul Anderson's version. So, by the same token, perhaps we should rename the D&D troll to something else.
Since you have a new player that buys the Players Handbook 2 thinking that it is an updated version of the Players Handbook 1, I really could not tell you what a new player would think of a particular word.
However I would imagine that a DnD Troll would be more well known then either of the 2 LotRs Trolls and the "Billy Goats Gruff" version is completely useless as a Monster Manual.