Sucker

The Tenth Doctor observed that Zygons were covered in suckers. (TV: The Day of the Doctor) River Song once angered Zygons by greeting them with, "What's up, suckers?" (GAME: The Eternity Clock)

The Daleks made use of suction cups, also known as sucker arms or simply suckers. (PROSE: The Dalek Generation, Prisoner of the Daleks)