Cony-catcher 

Any con-man, trickster, pimp, or thief looking for an innocent mark, or "cony", to trick.

That cony-catcher is just waiting for a rube to shakedown.

Cony-catcher by Erin Montgomery May 1, 2010

Cony-catcher 

Con-men, tricksters or thieves looking for someone to peel.

"Watch out for Old Nick the Stick, that cony-catcher is looking for rubes like you to con out of their drawers."

Cony-catcher by Zed Numar July 25, 2021