There isn't a single, universally accepted nickname for someone who cleared land of thick prairie grass. However, here are some possibilities based on the historical context and the nature of the work:

Based on the tool used:

* "Sodbuster": This is the most common and well-known nickname, referring to the use of plows to break up the tough prairie sod.

* "Prairie Breaker": This term emphasizes the challenging nature of the task.

* "Sod-cutter": This is a more literal description of the work.

Based on the location or time period:

* "Homesteader": This term refers to the people who settled and claimed land in the American West.

* "Pioneer": This broad term encompasses those who ventured into new territories, including those who cleared the prairie.

Other possible nicknames:

* "Prairie Man/Woman": This simple nickname signifies someone who is connected to the prairie.

* "Land Cleaver": This evokes the image of dividing the land.

Ultimately, the best nickname would depend on the specific historical context, the region, and the personal qualities of the individual.