Neologisms occur in the English language very frequently.
Example
Neologisms may become accepted language or disappear through lack of use, but recent examples include analysis, paralysis, WMDs, VJ, bimmers and no-fly list.
In the classroom
There are many ways neologisms are created and this can be an interesting area for learners to work on. Neologisms are formed, for example, by blending, by borrowing from other languages, from acronyms and from affixes.
Further links:
https://www.teachingenglish.org.uk/article/new-words-english
https://www.teachingenglish.org.uk/article/how-new-words-are-created