The Kreetassans weren't introduced until Star Trek: Enterprise, so they don't appear in any of the other earlier productions. In terms of canon, their current status is unknown.
However, in the novel The Buried Age, the character Onna Karapleedeez (mentioned by Tryla Scott in TNG: Conspiracy) is identified as a Kreetassan who fell victim to those little insect-like parasites that were taking over people.
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