Granny Gross is an action figure from the Haunted Humans line of villainous characters for the Real Ghostbusters line. She looks like a sweet old lady but when you pull up on her hat she turns into a gruesome monster. She has a third eye under her hat (it's a sticker) and her normal eyes bug out of her glasses. Granny's entire torso opens up to reveal a huge mouth with a long tounge and sharp teeth.
Granny Gross always reminded me of the librarian in the first Ghostbusters movie where the ghost was fairly normal and then became hideous after Ray shouted "Get her!" As a kid if I didn't use her as a Ghost I would pretend she was a client that would come into the firehouse to hire the Ghostbusters.