(Grammar Nazi alert) Octopi is the only incorrect one (weirdly). You can have Octopuses or Octopodes but not Octopi apparently.
I assume because it’s not a Latin word?
What, they didn't have clams in Rome?
@AlexD started
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(Grammar Nazi alert) Octopi is the only incorrect one (weirdly). You can have Octopuses or Octopodes but not Octopi apparently.