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Sticklebacks aren’t a single species.  |
Three-Spined Stickleback then, I'm just usually referring to that species, and so don't bother putting the rest in.
And don't you even dare start lecturing me on subspecies.
Ahem, anyway...
Language? Oddworldians have obviously come to an arrangement where they all speak the same language, Mudokons being taught Glukkon language since they are to become slaves, and the same for Sligs, though this would not explain how Munch could speak the same language. It may have eben estabilished, years ago, that they all speak the same language for beneficial reasons, otherwise one race (probably Mudokons) learned to effectively create a language, and this was imitated by the others.
Out of game reason is obvious, otherwise we wouldn't know what they were saying. Few game designers bother making an alternative language that needs subtitles, and even then, usually (if always) only for a singular race/species whatever, while most of the game inhabitants in that game would still speak english/french/spanish/scottish or another recognisable language to us.