The term 'Grumpy Guy' can be described by two crossword solutions: CRAB (4 letters) and OGRE (4 letters). A CRAB is a crustacean with a hard shell and five pairs of legs. It is known for its bad temper and tendency to pinch. An OGRE is a mythical creature that is usually depicted as a large, hideous humanoid with a taste for human flesh. Both creatures are often used in literature and folklore to represent grumpiness and ill-temper.