troll (n.)
"ugly dwarf or giant," 1610s, from Old Norse troll "giant, fiend, demon." Some speculate that it originally meant "creature that walks clumsily," and derives from Proto-Germanic *truzlan, from *truzlanan (see troll (v.)). But it seems to have been a general supernatural word, cf. Swedish trolla "to charm, bewitch;" Old Norse trolldomr "witchcraft."
The old sagas tell of the troll-bull, a supernatural being in the form of a bull, as well as boar-trolls. There were troll-maidens, troll-wives, and troll-women; the trollman, a magician or wizard, and the troll-drum, used in Lappish magic rites. The word was popularized in English by 19c. antiquarians, but it has been current in the Shetlands and Orkneys since Viking times. The first record of it is from a court document from the Shetlands, regarding a certain Catherine, who, among other things, was accused of "airt and pairt of witchcraft and sorcerie, in hanting and seeing the Trollis ryse out of the kyrk yeard of Hildiswick."
Originally conceived as a race of giants, they have suffered the same fate as the Celtic Danann and are now regarded in Denmark and Sweden as dwarfs and imps supposed to live in caves or under the ground.
troll (v.)
late 14c., "to go about, stroll," later (early 15c.) "roll from side to side, trundle," from Old French troller, a hunting term, "wander, to go in quest of game without purpose," from a Germanic source (cf. Old High German trollen "to walk with short steps"), from Proto-Germanic *truzlanan.
Sense of "sing in a full, rolling voice" (first attested 1570s) and that of "fish with a moving line" (c.1600) are both extended technical applications of the general sense of "roll, trundle," the latter perhaps confused with trail or trawl. Figurative sense of "to draw on as with a moving bait, entice, allure" is from 1560s. Meaning "to cruise in search of sexual encounters" is recorded from 1967, originally in homosexual slang.
Ref: Online Etymology Dictionary
