noun
rubber duck
A toy duck made of rubber or similar material, typically used as a bath toy. The term is a direct loan from English and is widely understood in Japanese.
お風呂にラバーダックを浮かべて遊んだ。
I played with a rubber duck floating in the bath.
子供がラバーダックを握って離さない。
The child won't let go of the rubber duck.