Elf
An elf was a mythical being that was often the subject of Earth fairy tales. 

When James T. Kirk discovered, in 2267, that violent emotions were the means required to destroy the Omicron spores that had taken over his crew, he was forced to make several insulting remarks to his first officer Spock in order to break him free of the spore's influence. While insulting Spock's Vulcan heritage, Kirk referred to Spock as "an elf with a hyperactive thyroid," later adding that Spock "should be squatting on a mushroom instead of passing himself off as a man." ()

Upon meeting Spock in 2269, Lucien referred to the Vulcan as his "elfin friend." ()

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Fictional characters