pic·a·roon /ˌpɪkəˈrun/
-noun 1. a rogue, vagabond, thief, or brigand.
2. a pirate or corsair.
-verb (used without object)
3. to act or operate as a pirate or brigand.Also, pickaroon.

[Origin: 1615-25; < Sp picarón, aug. of pícaro picaro]

Source: Dictionary.com.

My plan was to pose as visiting ‘High Pickaroons’ – the cream of roguish society.

Source: Von Bek, ‘The City in the Autumn Stars’, Michael Moorcock.