I don't want to get too technical with this, but the Grunts real name is Unggoy. They are apart of a faction known as the Covenant, genocidal aliens bent on eradicating human life in a video game called Halo. Phew, thank the lord they don't exist XD They were funny back in Halo CE, 2 and 3, but in Halo Reach, they are a lot more serious looking. To be honest, I just like the Grunts because they literally swear at you using the English language, it's hilarious XD