What is a medium grained wheat that often served as an alternative to oatmeal?

The medium-grained wheat you're likely thinking of is farro.

Farro is a versatile ancient grain that offers a nutty flavor and chewy texture similar to oatmeal. It's a good source of fiber, protein, and minerals, and can be used in a variety of dishes like salads, soups, and risottos.

While not exactly a direct substitute for oatmeal (they have different nutritional profiles and cooking methods), farro can be a satisfying and healthy alternative for breakfast or other meals.