Grankhul
Grankhul is the twin god of Hruggek, one of the two racial gods of the Bugbear species. He is the god of stealth and ambush, said in bugbear folklore to have been the one to teach the Bugbears the stealth they needed to survive in a hostile world dominated by dragons and giants in ages past.
Grankhul has no formal church, cult or structured religion at all. He has almost no priests outside of bugbear shamans who maintain his rites and ceremonies as part of their oral culture. Instead he tends to be venerated by rugged individualists, trappers, hunters, explorers and bandits who live out in the wilds and need to depend on their wits, silent feet and brutally swift ambushes to get by.
Most people have likely never even heard of Grankhul as it is one of a thousand lesser gods known throughout the world, and the few who do know of him tend to regard his worshippers with suspicion if not outright hostility due to their reputation as bandits and marauders.