These heads of powerful talking Olmec rulers were featured in what Nickelodeon show which aired from 1993 to 1995?
Legends of the Hidden Temple: Legends of the Hidden Temple is an American action-adventure game show that aired from 1993 to 1995 on Nickelodeon. Legends of the Hidden Temple:  Created by David G. Stanley, Scott A. Stone, and Stephen Brown, the program centered on a temple that was "filled with lost treasures protected by mysterious Mayan temple guards". Olmec colossal heads: The Olmec colossal heads are at least seventeen monumental stone representations of human heads sculpted from large basalt boulders. Olmec colossal heads:  Given that the extremely large slabs of stone used in their production were transported over large distances, requiring a great deal of human effort and resources, it is thought that the monuments represent portraits of powerful individual Olmec rulers.
Legends of the Hidden Temple