Bucko(originally named Colin) and Sqiffy(Landon) were originally a pair of troublemakers that could not keep a job due to their troublemaking tendencies. When Nadakhan took over Ninjago, they joined the pirate crew and were renamed Bucky and Sqiffy. They were usually sent as scouts and managed to avoid being turned to stone as they were not present.
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This new recruit to Nadakhan’s crew isn’t really called “Bucko” but both he and his captain thought that sounded suitably “piratey”.