Technically, a troupe is a group of performers.
"a company, band, or group of singers, actors, or other performers, esp. one that travels about."

I've heard the word Company used as well, interchangably with troupe sometimes. There seems to be a it of a crow-bar seperation between the two.

The only "grouping" work I've heard that relates only to tribal bellydance is "tribe," as in "What tribe do you belong to?" But I don't like the word, since I'm not in a tribe actually - in my brain that indicates something totally different: family and cultural bonds in a small community.

nah, thats not a tribal specific term...its been used for groups of dancers since before there was such a thing as tribal even, im sure!

I think it might have a tribal connotation because we are used to thinking of tribal dancers in troupes, and maybe not so with raqs sharqi/non tribal, but it is indeed so, and term applied even outside bellydance.

dictionary.reference.com/browse/troupe

it's been an accepted term for group for a long long time - definitely before there was tribal.
I use a fine distinction between troupe and group though. I use "group" as inclusive; "troupe" as exclusive, meaning a troupe has set membership, whereas a group does not.