https://en.wikipedia.org/wiki/Making_Comics
As with its two predecessors (“Understanding Comics” and “Reinventing Comics”), Making Comics is itself in comic book form, with McCloud’s avatar leading the reader through the pages. The book details the processes behind storytelling, character design, and other challenges specific to the medium, with illustrative examples drawn from the history of comics. Complex topics are frequently boiled down to a few principles, such as classifying cartoonists into four types, or identifying the “six basic emotions”.
Page samples:
https://www.google.com/search?q=scott+mccloud+making+comics+page+samples&udm=2
The cropped pic above is just me fooling around with some online tools & GIMP. The faces look kinda like traditional theatre masks, so I just rolled with that. Here’s the full diagram page, which I upscaled with “Waifu2” (very good for comic art):
No need to be sorry. I’m not a native English speaker, so it’s not surprising that I wouldn’t know. And it’s always nice to learn a new word.
I’ve actually used this kind of boxes at work in the past, but have no idea if there’s a specific word for them in French.