I see where you're coming from, what makes these signs less applicable to the Inuit compared to other nomadic civilizations? The Scythians, the Huns, and the Inuit all never really had those city-building and agricultural traits.
They could use more modern Inuit settlements (Iqaluit, Kuujjuarapik, Qikiqtarjuaq, etc). Its what they did with some cities for the Cree (their capital, Mikisiw-Wacîhk, is the Nehiyaw word for the Red Pheasant reservation, and the city of Mistahi-Sipihk is Nehiyaw for the town of Big River, many of these places were founded by Canada mind you, just referred to by their Cree names).
Regarding leaders, the Inuit may have to fall under more mythological/legendary leaders with some evidence pointing towards their actual existence, but Civ 6 isn't opposed to that (see Gilgamesh, Kupe, Dido). The best choice IMO could be Ekeuhnick (who is considered many historians to actually have existed), being the one who, according to legend, taught the Inuit their adaptive lifestyle, and is considered to be THE first Inuit.
Here's a link detailing the legend of Ekeuhnick if you're interested:
http://www.alaskool.org/native_ed/historicdocs/people_of_kauwerak/kauwerak.htm