Dwarves, sometimes spelled dwarfs, were mythical creatures.
The First Doctor encountered elves and dwarves on Elbyon. (PROSE: The Sorcerer's Apprentice)
Professor Reginald Tyler's The True History of Planets was a twentieth-century book about dwarves and swords and wizardry. (PROSE: Mad Dogs and Englishmen)
Michael Doran was a dwarf called Cute in a dreamscape created by a Perfecton missile. (PROSE: Oh No It Isn't!)
Behind the scenes
In non-valid sources
A dwarf was once with the White Witch in Narnia. (TV: Future Generations [+]Children in Need (BBC1, 1998).)