The Khesh’dar are split into two primary traditions. The Taarka’khesh (“Silent Wolves”) are swift scouts, experts in wilderness reconnaissance and targeted strikes. The Taarka’khesh typically rely on worg cavalry; many develop an unusual primal bond with their worg companions, and the golin’dar view the worgs as partners, not beasts. Though worgs don’t have an innate tie to the Uul Dhakaan, the Beast Master rangers of the Taarka’khesh can summon their worg companions to them while dreaming.
Source: Exploring Eberron
The taarka'khesh ("silent wolves") is a corps of goblin scouts trained to provide intelligence in the field during military operations.
By ancient tradition, the Silent Clans do not take sides in any conflict. Instead, they act as mercenaries, providing their services to all sides and fighting their brothers when they face one another on the battlefield. This reputation for complete impartiality and reliability has kept the khesh alive for thousands of years. Its own clan will execute a goblin that betrays the secrets of a client. Generally speaking, one must be born into a khesh clan to learn its ways, but on rare occasions skilled goblins from other clans have gained admission to one of the Silent Clans.
Source: Eberron Campaign Guide