Did you perchance mean misses?
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“Fairies, elves, water-sprites, and nisses or brownies, have constantly required mortal assistance in the nursing of fairy children.”
“In the stories of the North lands of Europe, as we are told in the Eddas and Sagas (the songs and records), there are likewise many wonderful beings -- the Trolls, the Frost Giants, curious dwarfs, elves, nisses, mermen and mermaids, and swan-maidens and the like.”
“Here the Scandinavian countries -- Norway, Sweden, and Denmark -- are wonderfully rich in dwarfs, and giants, and trolls, and necks, and nisses, and other inhabitants of”
These user-created lists contain the word ‘nisses’.
Turned this up on etymonline.com (link). It's amazing.
1937, coined in the fantasy tales of J.R.R. Tolkien (1892-1973).
On a blank leaf I scrawled: 'In a hole...
Looking for tweets for nisses.