The Frenchman River, (Gros Ventre: níhʔɔɔtóóúníícááh, lit.

[2] The name's origin is uncertain although both Métis and francophone settlers inhabited its banks at the turn of the 20th century.

The Frenchman Formation, a stratigraphical unit of the Western Canadian Sedimentary Basin, was named for the river.

After the national park and the hills, the river turns south into Montana, where it flows into the Milk River, in Phillips County, Montana, north of Saco.

[4] Fish species found in the Frenchman River include walleye, yellow perch, northern pike, burbot, common carp, white sucker, and shorthead redhorse.