Nicarao
The Nicarao were a group of Native Americans who lived in Central America on Earth.
The Nicarao and Rubber Tree Peoples of Ometepe were the ancestors of the colonists on the planet Trebus. (PRO: "Observer's Paradox")
Appendices
Background information
While the Rubber Tree People, originally mentioned in Star Trek: Voyager, are a fictional tribe, the Nicarao are a real indigenous people who live not just on Ometepe, but also elsewhere in western Nicaragua and northwestern Costa Rica.
According to Aaron Waltke, this connection to a real-world people was introduced due to feedback from the indigenous community to Chakotay's characterization in Voyager. "Yeah, I think there's no question that the character of Chakotay was not used to his full potential previously. And there were certain aspects of his character, especially his heritage, where we listened to the indigenous community who said, 'We don't want him to be just from a made-up tribe, we want a heritage that is actually real and would align with what we know about his backstory, and where Robert himself has his lineage from. And so, it was important to us to try to rectify some of those mistakes." [1]