duck puppy

A semiaquatic egg-laying mammal endemic to eastern Australia, including Tasmania.

See Platypus

Person 1: "That duck puppy is just sitting there."
Person 2: "Yeah, they don't do much."

duck of a puppy

large dog that curls up and sleeps like a duck would. It also thinks that it is a lap dog and at times will flap its ears like a duck flaps its wings. It never becomes an adult dog it is always a puppy.

Look at how big of a duck of a puppy she is.