Agaran Villages are groupings of simple wooden houses with Mushroom Block roofs. The villages are populated by Agaran villagers and guards, as well as passive mushroom critters. Merchants in the villages sell mushroom-based foods. Agaran villages are found within the surface Mushroom Patch mini-biome that occasionally spawns within forest major biomes. As such, they can be found on many types of planets in the universe, but are most likely to be found on Forest planets.
See the Mushroom Patch mini-biome article for a detailed accounting of the materials, monsters, and objects that can be found in Agaran villages. Also see the Agaran article for details on how the Agaran and their villages changed between beta development and the official release.