Please find a word to fit the definition below:

One who poses as a satisfied customer or an enthusiastic gambler to dupe bystanders into participating in a swindle.

Now we have had:


Please add yours.
stool pigeon, stoolie, decoy, come-on man, plant
Is 'stooge' sometimes used in this sense?

Or has someone sold me a pup?
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Yes, as far as I know, "stooge" is used that way.
It's confusing because some people use "stooge" to mean the victim of a con, not the accomplice.
Most often though, I think of a stooge as an underling, a flunkey or yes-man, regardless of whether a con game is involved.