What do you call a scientist that studies earth's land forms?

Answer 1

This falls between two disciplines, that of the Geographers and that of the Geologists, the experts on the field are called Geomorphologists.

Answer 2

A scientist who studies Earth's land forms is called a geomorphologist. They investigate the processes that shape the Earth's surface and the features that result from these processes, such as mountains, valleys, and Coastlines.