Splledarks were beings that inhabited Endor, which is a wooded satellite in planetary rotation around a planet also called Endor. The local Ewoks would pursue splledarks as a source of food, frequently consuming them after roasting.
Tom Angleberger mentioned splledarks in his 2015 book for young readers, Return of the Jedi: Beware the Power of the Dark Side!. This novel is a re-imagining of Star Wars: Episode VI Return of the Jedi.