From Creatures Wiki
The vendor first appears in Creatures 1 as an immovable carrot dispenser, located on the uppermost level of the island, which can only be activated by creatures. The concept soon gained popularity among players, with many developers creating vendors. This trend continued with the release of Creatures 2 and Creatures 3, though these games only come with a few "official" vendors.
Vendors are a major food source in Docking Station, which has a more compact and arguably more "artificial" world. The most notable of these is the Empathic Vendor. Vendors also show up in the Creatures Village games.