Humongous (1982)
The monstrous offspring of a violent crime grows up in seclusion on a remote island, where a boat-full of hapless teens have shipwrecked, unaware of what's lurking in the woods.
Directed by: Paul Lynch
Starring: Janet Julian, David Wallace, John Wildman, Janit Baldwin, Joy Boushel, Layne Coleman
Links: IMDb, Movie posters, Movie stills