What little there is about fey societies amounts to:

-Seelie Fey are a thing... somewhere.

-Unseelie Fey are a thing... also somewhere.

-The Sidhe are a thing, on a fey demiplane.

-The Silthilar had a nice fey world somewhere, but it was destroyed long ago.

-The LeShay had a nice fey multiverse somewhere, but it was destroyed even longer ago.

Smaller groups would be: dryad groves, mirage mullahs, and similar fey might be found together.

The only fey I know of called out as being 'troops' are the Thorns.