Same, I was really hoping for a YouTube smackdown. I would bet on the Platypus though, I don't see the cat doing enough damage to win it.
Platypodes sounds cooler. But there really isn't a correct plural form of platypus, mostly because it is basically a nonsense word in the first place. Platypus is a Latinized version of two Greek roots, so it is rather unclear if it should use a Latin plural (Technically Platypae, usually stated as Platypi),a Greek plural (Platypodes), or an English Plural (Platypuses or Platypus). Technically Platypus isn't even the actual name of the animal, since
this weevil was named Platypus first, so the scientific name of the mammal was changed to Ornithorhynchus, which means bird nose. But people stuck with Platypus as the common name.
Short version, the name is a mess, which is pretty fitting actually. Call it whatever you like (Except Ornithorhynchus, because nobody knows what that is).