The article "Words, Non-words, Nonce Words" in the May 1971 Word Ways touched briefly on coined words. By this I mean words not in any dictionary, not in the spoken or written literature, in fact not in any known place -- but "words" that should be words, at least in the mind of some logologist. The article concluded that words coined only for their logological uniqueness were examples of bad logology.
Beaman, Ralph G.
"An After-Dinner Mint,"
Word Ways: Vol. 5
, Article 14.
Available at: https://digitalcommons.butler.edu/wordways/vol5/iss2/14