Okay, again, there have been TWO games where the word Chocobo has been pronounced out loud. The first was Final Fantasy VI. You can hear it at the very beginning to the song Techno De Chocobo where the phonetics are very distinct for being muffled by a vocoder and the SNES's lousy sampling rate. It was said again in Final Fantasy X and the pronunciation was crystal clear. It is pronounced with short Os. Choh-koh-boh.