Final answer:
The Oompa-Loompas are fictional characters from Loompaland in Roald Dahl's book, Charlie and the Chocolate Factory, where they work in Willy Wonka's chocolate factory.
Step-by-step explanation:
The Oompa-Loompas are from Loompaland, which is a fictional region in the world of Roald Dahl's book, Charlie and the Chocolate Factory. They are depicted as small, humanoid creatures who are known for their distinctive songs and their roles as workers in Willy Wonka's chocolate factory. Throughout the book, the Oompa-Loompas are responsible for various tasks within the factory and often sing songs that serve as moral lessons related to the misadventures of the naughty children who win a tour of the facility.