Trandoshans are large, bipedal reptilian humanoids from the planet of Trandosha. They have sensitive eyes that could see into the infrared range and the ability to regenerate lost limbs—albeit slowly—and were anatomically built heavier and stronger than most humanoids, including humans. They would also periodically shed their skin. The Trandoshans were a warlike species who allied early with the Empire, taking Wookies as slaves.
As a species, they were renowned across the galaxy for great strength. This is evidenced by several members of other species boasting physical prowess and power by having defeated a Trandoshan, either in battle or in a contest of strength. (Taken from Wookieepedia)