The Tojj clan was a group of Wookiees originating from the planet Kashyyyk. A long-standing, multi-generational conflict existed between them and Chewbacca's family, stemming from the death of Tojjevvuk, a well-known Tojj clan member. Tojjevvuk perished in a duel against Chewbacca for the affections of Mallatobuck in 155 BBY. Despite Tvrrdko, Tojjevvuk's father, eventually forgiving Chewbacca after he rescued Tojj clan children from enslavement, a sense of animosity reportedly remained between the Tojj clan and Chewbacca's kin, even fifteen years following Chewbacca's demise on Sernpidal during the Yuuzhan Vong War. Notably, Tojjelnoot, who served as the council leader of Kashyyyk during the Second Galactic Civil War, held no ill will toward Chewbacca's family.
In the Chewbacca comic series, Tojjevvuk and his father appear as characters in flashback sequences. However, it wasn't until the novel Legacy of the Force: Inferno that Troy Denning created the Tojj clan, identifying Tojjevvuk and Tojjelnoot as members, and establishing that the feud persisted into the timeframe of the novel's setting. It is assumed that Tvrrdko was also a member of the clan, even though his name lacks the "Tojj" prefix.