Option 1: The Boro tribe is not known for practicing pastoral nomadism. They are an agricultural community that primarily relies on farming for their livelihood.

Option 2: The Masai tribe is known for practicing pastoral nomadism. They are a tribe in East Africa who migrate with their livestock in search of water and grazing land.

Option 3: The correct answer is the Fygmies tribe. They are a group of indigenous people living in the rainforests of Central Africa. The Fygmies practice nomadic herding, moving their livestock to different areas in search of fresh pasture.

Option 4: The Eskimo tribe, also known as the Inuit, primarily rely on hunting, fishing, and gathering activities rather than practicing pastoral nomadism. They inhabit the Arctic regions of North America and Greenland.

In conclusion, the Fygmies tribe is the correct answer as they are known for practicing pastoral nomadism.