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Oh weiiird! I had no idea it was a thing! The Greckon is the oily creature in @ghostfish 's story :D I'm still heavily digging your interpretation.

Yes, I thought it was a concept of some kind - like an orc or maybe a local name for a baby, but it can of course be a self invented name for an alien (like Klingon) - I am not a native English speaker so I sometimes presume I am missing something when I am not.