The Green Knights?
The Jade Cavaliers?
The Emerald Knights Errant?
The Green Hornets? Second in command will need the callsign of Kato.
The Chartreuse Champions?
The Green Square Deal? If your company has a rep for honest dealings and an environmentally friendly modus operandi.
The Malachite Marauders?
The Green-Eyed Monsters?
The 10th street Can't-Think-Of-A-Name Gang?