For MOP
There is a bit more
Terrific (H)/Terrifying Twinks (A) - Skarr - All bracket twinks
Purple Haze (Either stolen or Sold, no longer active)
ToS Clan (Both factions, but guild is a horde one) - The leader is unknown but he is referred to as Prime.
Ghost Twink Clan is similar to TOS, but their somewhat inactive leader is called Pankudo. (They are part of any guild on FW and come together somewhere in silverpines, those who have a faction.)