[Blikkentrekker]

All my friends say “octopodes”.

Some people on the internet keep saying that that's wrong; I find that very strange.

>because we don't pluralize any other word that way.

Certainly we do “platypodes”, “matrices”, “irides”, “clitorides” and “vortices”, are all quite common words.

[istjohn]

I had never heard of three out of five of your "quite common" words.

[jgwil2]

Clitorides? Come on, your pulling our legs.