Neologisms is the term for new expressions.

- List of some of the mechanisms that create them:

https://www.theguardian.com/media/mind-your-language/2016/fe...

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If anyone is familiar with new word discovery algorithms and has links to notable research, code, etc. — I would be interested looking at them.

Here's one I've come across before: https://www.scss.tcd.ie/~mtemms/Papers/neologism.pdf

edit more recent version: https://aclanthology.org/C16-1129/

Thanks; oddly didn’t even think to try looking for research with some variation of neologisms within it.