Bossk is a Trandoshan bounty hunter, one of the six summoned by Darth Vader to find the Millennium Falcon in The Empire Strikes Back (1980). Trandoshans regenerate lost limbs and shed their skin, and their long-running enmity with the Wookiees has been a fixture of the setting since the Legends era.
He recurs across both continuities — in The Clone Wars, where a younger Bossk works alongside Boba Fett, and in the Legends bounty-hunter fiction of the 1990s.
Catalogue entry. This figure has a verified record here rather than a full write-up — the encyclopedia labels its own depth instead of padding it.