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)

Behind the scenes
The illustration of the Gnome on the cover of Golden Age is clearly reminiscent of Rien Poortvliet's Gnome mythos, first seen in his 1976 book.