Rubber duck

A rubber duck (or ducky) was a type of children's toy on Earth, in the form of a Terran duck. Made of rubber or similar material, it was most commonly used by very young children while bathing.

Commander Nyota Uhura of the USS Intrepid II (Oberth class), during a confrontion with Romulan Commander Avrak, insulted him by comparing his ship, the, to a rubber ducky.