The Fire Gleeok head tiles are on page 28, as seen in the first image below.
But, the default value for misc 8 (the tile used for an attached head, as an offset from the E. Tile) is set to 156, and the default value for misc 9 (the tile used for a flying head, as an offset from the E. Tile) is set to 216, making the fire gleeok use the head tiles for the normal gleeok, as seen in the second image.
I had to set the value for misc 8 to 336 and the value for misc 9 to 396 to make the fire gleeok enemies use their specified head tiles on page 28.
Fire Gleeok Head Tiles Not Quite Defined Right
Fixed in the next build.