Mudokon Pop
Warlord
Caral on Xandinho's list is another name for Norte Chico.These would all be very interesting, but, like other equally fascinating civilizatios, like the Norte Chico, Nazca, Wari, Tiwanaku, Ancestral Pueblo (formerly called, "Anasaszi," until it was grasped that term was a perjorative by their enemies at the time, the Navajo - similar to how, "Eskimo," was such a perjorative for the Inuit by the Gwi'chin - another Athabaskan-speaking group, interestingly), and whomever builtt that built city in the Amazon or Great Zimbabwe, and the speakerso of the North Picene language. Even without the theoretical need for a leader speaking a language, I fear there's not remotely enough to work with, and that is truly tragic. ;(
I agree it would be very difficult to create unique units and buildings for these civs. At least the Moche in Peru made pottery depicting their warriors and constructed large pyramids. Language souldn't be an issue for the Wari who likely spoke Quechua just like the Inca, Tiwanaku's people possibly spoke the Aymara language and the Shona languages in Zimbabwe are still widely spoken.
For Great Zimbabwe, there is something to work with as there are many successor Shona kingdoms who continued to build stone enclosures. Stone enclosures (dzimbabwe) were often built on the internal boundaries of chiefdoms within the kingdoms - perhaps a way of mediating between internal disputes or exerting control. If loyalty is a mechanic in future games, each city building a dzimbabwe structure to increase loyalty could work. An adjacency bonus for cities who's dzimbabwe districts border each other would a neat mechanic.