Via Starwars.com:

Introduced in The Empire Strikes Back in the short but memorable scene on the Executor, Bossk was one of the few non-human characters in the movie. The Trandoshan also had a cameo in Return of the Jedi, but it wasn’t until the nineties that he (and his fellow bounty hunters) truly entered Star Wars stardom. West End Games created a background for Bossk that was later expanded, last but certainly not least in Star Wars: The Clone Wars where Bossk made several appearances. In more than three decades a lot of merchandise has been produced about Bossk that will enable you to set-up a nice collection of Bossk goodies only. Who still dares to comment that bounty hunters are scum?

3.75” Action Figures
Most fans of vintage Kenner toys know that Boba Fett was available as a mail-away before The Empire Strikes Back was released, but so was Bossk. He was announced as a “secret action figure” in 1979 and you were able to get him in a white mailer box with four proofs-of-purchase. Carded Bossk appeared in the first wave of Episode V and was also released on Jedi and Tri-logo cards. The vintage figure has a few variations and features quite some nice details. Its spacesuit is well sculpted and it comes with a unique weapon.

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