Gnome

Gnomes were small humanoids of mysterious origins. They appeared in Earth's myths and fairly tales.

History
The nature of gnomes' original homeworld was a mystery. (PROSE: Golden Age)

The Eighth Doctor encountered gnomes on the planets Albert. (PROSE: Grimm Reality) There were also gnomes on Caligaris Epsilon Six, although they were genetically-engineered recreations of the mythical figures, designed to make the planet into a popular holiday destination for humans. (COMIC: A Fairytale Life)

Father Christmas said that one could teach a gnome to build a wooden train, but not a games console. (AUDIO: Death in Blackpool)

In fiction
Gnomes were among the creatures depicted in The True History of Planets, a fantasy series by Reginald Tyler. (PROSE: Mad Dogs and Englishmen) Gnomes existed in the fictional universe inhabited by Harry Potter. (PROSE: Golden Age)

Behind the scenes
The illustration of the gnome on the cover of Golden Age is clearly reminiscent of the gnomes as illustrated by in 's 1976 book.