Shill and Sitting duck

Shill noun - A decoy who acts as an enthusiastic customer in order to stimulate the participation of others.

Sitting duck and shill are semantically related. in bait topic. In some cases you can use "Sitting duck" instead a noun "Shill".

Sitting duck noun - A person or thing that is the object of abuse, criticism, or ridicule.

Shill and sitting duck are semantically related. Sometimes you can use "Shill" instead a noun phrase "Sitting duck".