Bog (1978)

aka: The Bog Monster

When a local begins fishing with dynamite in Bog Lake, a green, bug-eyed mutant monster awakens from a long sleep, and promptly begins killing and eating fishermen who stumble across its lair. When biologist Ginny Glenn (Gloria DeHaven) discovers the creature’s evolutionary nature, the local sheriff (Aldo Ray) decides to destroy the tenacious beast. Also with Marshall Thompson.