Goblintown

From the introduction:

Goblintown is a role-playing game about the wretched (but never dull) lives of a warren of goblins trying to defend their community against endless perils. It is suitable for either a one-shot or a short campaign. Each session plays out in about 60-90 minutes, but you can easily chain two or three events together for a more involved story about the volatile fortunes of the town. The game is designed for a group of 4-6 total players: 1 GM who “runs” the game and 3-5 players with goblin characters.