Myconids In SiT! They’re street cleaners, removing offal, dejections, basically any organic waste. Sometimes they get a little less discriminatory about the unmoving quality of their sweepings.
That’s something I came with while reading Jeff Vandermeer’s book:
What I’m stealing for my setting is only the cruder idea of the Gray Caps of Vandermeer, who aren’t even mushroom creatures as such, but are fuzzily described as smaller humanoids with a weird civilization based on advanced fungi technology.
The total creepiness and sinister threat of the Gray Caps I leave out, only because it won’t do thematically for my setting, but it was a very good read!