Look up Heterogenous Linguistics. I last checked in on it a few months ago, but at that point it was a very meaty dive into speculative RPG-monster linguistics, by way of a linguist traveling to an island of monsters and doing an ethnography. Page-by-page web manga format.
I went back through this thread and both of your posts caught my eye as this sounded really cool. It turned out Heterogenia Linguistico is available on Google Play books, so I was able to use all my credit from surveys to buy the first two. I really like it and will be picking up the other two.