Pirate Goom
Pirate Gooms (also known as Spear Men) are brown Gooms that hold spears in Wario Land: Super Mario Land 3 and Wario Land II. They pace back and forth in most of the levels and make an easy kill. Their spears are pointed forward, so Wario should (obviously) avoid hitting them from the front.
Pirate Gooms are likey a distant relative of the Goomba. In fact, because of their apparent lack of a body, they highly resemble Super Mario World Goomba variety.
Interestingly, Pirate Gooms featured a minor change in appearance when the Brown Sugar Pirates upgraded into the Black Sugar Pirates in Wario Land II. In that game, they started wearing striped bandanas and toting tridents rather than spears (despite the fact that they are renamed "Spear Men" in that game).