If you happen to notice, the name 'platypus' comes as more of an unofficial name than a proper NATO code-name.
For the names of Russian planes, USA designates names beggining with the letter 'F' for fighters and 'B' for bombers. Eg. Fulcrum, Foxhound, Flanker, Backfire, Bear, Blackjack, etc.
The 'Frogfoot' is an exception, due to the fact that it's more of a CAS plane than a fighter.
This should be a rumour. The Su32/34s are carrier based aircraft. So only France, Great Britain, Russia and the USA (and does Japan have any???) would have the imperative to purchase them.