Yes, "zoa" is already the plural form. The word "zoa" is the plural of "zoon", which comes from Greek and means "animal". In the context of biology, "zoon" refers to an individual animal as opposed to a species or group. So if you're talking about multiple individual animals of a species, then "zoa" would be a correct term to use. Just like "criteria" is the plural of "criterion", "zoa" is the plural of "zoon". And just as you wouldn't say "criterias", you wouldn't say "zoas". It's a bit tricky sometimes, but that's what makes language so fascinating!
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