This question already has an answer here:
Meaning like this, where there's a fixed width, and every line is scaled maintaining its aspect ratio to meet the width - including scaling the height (unlike regular justified text).
There might be tweaks to the tracking and kerning, but they're not the core feature of the style, which is the changing text size:
Woah! While finding examples I just noticed we have an almost-identical question already:
But those answers don't give a name for this style, they're just typographic terms, some of which may be used in creating this style, but none of which are this style.
Is there a name for this style, where the size (width and height) is adjusted to make each line equal in width and to bring out certain words?
It's not "justifying", because that doesn't involve changing the size of text, that only changes the letter spacing or occasionally width. It never changes the height. It's not "typesetting", which is setting type. 99% of the work of typesetters is not in this style.