I first saw this colourful term on a wall poster supposedly copied from a Las Vegas / Los Angeles / San Francisco wherever 1881 / 2 original poster at a friends house back in the 1970’s.
Bunko steerer; noun Informal
A swindler or confidence trickster, especially a person who lures another to a gambling game to be cheated.
Origin 1870-75 North America
Oh my, there are so many people to whom this term applies. I’m sure my reader will be able to come up with a plethora of names without really having to think.