Doctor Trag'tok was a male resident of Deep Space 9 in 2374. His species had three eyes.
Jadzia Dax suggested that Kira Nerys bring Trag'tok with her for a dinner together with Dax and Worf, as he was intelligent, well-built, and unlike Captain Boday, did not have a transparent skull. Kira refused the suggestion, as Trag'tok's middle eye bothered her. (DS9: "Resurrection")
This character was only mentioned in dialogue.