Is “Troll” a Scrabble word?

1.A supernatural being of varying size, now especially a grotesque humanoid creature living in caves or hills or under bridges.

2.An ugly person of either sex, especially one seeking sexual experiences.

3.Optical ejections from the top of the electrically active core regions of thunderstorms that are red in color that seem to occur after tendrils of vigorous sprites extend downward toward the cloud tops.