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I am sure they are called a presenter as well because they are (presenting) the programme which is coming on next. Hipprocker.
everytime he introduces me to a group of people he introduces me as his "Judy", his exwife.
slave
a slave
Understudy
Cheater
MC or Master of Ceremonies, Ringmaster in a circus, Host (tv show) Commentator (news), etc.
An accomplice. and in some cases the authorities have termed a person a broker when they introduces a party to another party with a belief that the newly associated parties may together commit a crime.
advitiser
A call originator is the person placing a call to another subscriber on a telephone network.
When a person is namedafter another or has the same name as another person we call him/her namesake. The origin is probably the idea of "a person named for the sake of another".