Goat Poo is a troll found in the troll town of Weiss. During Making Friends with My Arm, he, along with the rest of the Weiss trolls, attempts to knock the player out by throwing rocks at them when they first sneak in the town.
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Trolls are named after the first thing they ate, which in this case was goat dung from a Mountain goat, similar to the mountain troll Dung.
Using a bucket of goat dung on Goat Poo after Snowflake and My Arm's wedding will make him say "Look, human, it were one time. Just once. Let a troll move on, okay?"