Yes, troll is a Scrabble word!

Verb

1. Circulate, move around

2. Cause to move round and round

3. Sing the parts of (a round) in succession

4. Angle with a hook and line drawn through the water

5. Sing loudly and without inhibition

6. Praise or celebrate in song

7. Speak or recite rapidly or in a rolling voice

Noun

1. (Scandanavian folklore) a supernatural creature (either a dwarf or a giant) that is supposed to live in caves or in the mountains

2. A partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time

3. A fisherman's lure that is used in trolling

4. Angling by drawing a baited line through the water