What's that thing called where you get a list of all the words used in a text and their frequency?

A graph representing the frequency of something is called a histogram. That might be the word you are looking for?

Word cloud?

I've always just seen it called a frequency table.

You looking for word frequently count?

Shot in the dark but maybe you're thinking of word2vec?

My wife studied linguistics, is the term you are looking for "corpus linguistics"?

This? https://en.wikipedia.org/wiki/Tf%E2%80%93idf

My Shakespeare teacher in college called it a concordance when we studied Macbeth. There was a full concordance and then concordances for each speaking part. Pretty fascinating stuff.

sometimes it's called bag of words

In interviews there's "coding" or "labelling". That's where you label certain phrases to find connections and meaning. If you're doing kwantitative research, that "coding" would also be kwantitative, so numbers. Which would be the counting of words

So. "Kwantitative coding". It's probably not what you're looking for, but it's the closest I could come up with.

Frequency analysis? Tokenisation? Not sure if either of those are what you mean

Word Trends is what this software called them. I always wondered how they know how many times fuck is used in a book, I had hoped they didn't have to count. https://www.maxqda.com/help-mx22/visual-tools/word-trends-analyze-frequencies-of-words-within-a-text