Viveen
Kestra Troi-Riker in a Viveen costume
The Viveen, or the Wild Girls of the Woods, were a fictional culture on Ardani created by a young Thaddeus Troi-Riker. According to his notes, they were "a 'barbarian' people who live in the deep forests of the Northeast, on the shores of the Great Lakes." Thaddeus created a language for them called Viveena, which he taught to the rest of his family, though his mother "never learned much" of it.
In 2399, Kestra Troi-Riker was dressed in a Viveen costume while hunting bunnicorns. (PIC: "Nepenthe")