text: my friend and i have had a long debate over the years of what sound a platapus makes do you know? i kinda explained all in the question..  i think they make a quack ish sound perhaps with a tinge of a squeak.. i have never heard one...i would guess some kind of quacking noise!!!  i have no idea!  i've never even seen one in real life.  you know that toy you put the arrow on the animal and it says what the animal is and makes the noise?  they should have had a platapus on it!!