Not sure what sort of Coprinus these are, but if you got an Idea which it could be, please do tell
I wonder what they talk about when no one is around
Probably one of the C. comatus varieties since it's the typical size in the typical habitat.
Identifying most other Coprinus to species is pretty specialized knowledge in the first place and your post doesn't have nearly enough information to do so. At the very least we'd need the location and closer photos including a cross section since that's the only way to see the gills on a Coprinus.