Do platypus rubber ducks exist?

Rubber Ducks are made of rubber because it is a cheap material and is very durable, and lasts a long time. Also, it easily cleans, especially if it is dirtied after you have left the bath, typically...

5p

well it's pretty much a duck made of rubber it's normally yellow but it's possible to have any other colored rubber duck and it is mostly used in the bath for little children

yes they do exist, they are native animals of Australia

To be perfectly frank, Australians do not call the platypus "duck-billed". This is a name given by non-Australians, simply because the platypus's bill is said to resemble that of a duck.