Goblin
A goblin is a mythical beast of various origins, primarily medieval. They are usually regarded as smaller versions of orcs only thinner, sneakier, and generally nastier. They are also a lot easier to kill. The goblin was probably based on the street urchin, or child thief, of medieval Europe, who would run around, steal, and occasionally do more dastardly crimes. Like orcs, they are usually shown as having green skin.