Bristol University has many fine academics on its staff, but undoubtledly one of the best is Professor Ronald Hutton. Here he is giving a lecture on the origins and purposes of fairy stories.
In the Q&A I discoverd that “trow” is an Orkney/Shetland word for “troll”. Local opinion has it that the town where I live was originally called Tree-bridge (treow-brycg in Old English), or True-bridge. From now on I am going to assume it is actually Trollbridge, because that’s much more cool.
Thanks to John Reppion for the link to the lecture.