Once again, not Mayan, but the closest ones I can immediately think of are the sukuyan, from Trinidad IIRC, and the Aztec civateteo. Though they're more witches, I believe.
Wait...on second thought, I recall reading a book called The Black Man of Zinacantan (sp.), which was all about Camazotz actually. The creature of the title is the h'ikal, and is from, IIRC, the state of Chiapas in Mexico (which is predominantly of Mayan descent). Can't recall any specific powers, but at least ya know what to look for. As an aside, the Zotzil, the main tribe in Chiapas, are also called the "people of the bat".
Strictly prehistorical, there was a larger species of vampire bat native to the region (and not today's false vampire bat, this was another, Desmodus draculae). Only marginally larger, but still.
EDIT: Itzpapalotl was the ruler of the netherworld known as Tomoanchan (Tamoachan, as in the Hidden Shrine Of?). She seems rather like Camazotz (and may be, as legends of the bat-god survived through to the Aztecs). And the Hidden Shrine of Tamoachan mentions Camazotz. Hmm.