Dehydrated, powdered masa is often referred to as instant corn masa. Maseca is a popular brand and can be found in most grocery stores. The flour is made from cooked ground hominy and looks like white cornmeal.
Cotija is an aged strong-tasting and somewhat hard, dry cheese made from cow's milk. Named for the town of Cotija, Michoacan, where it originated, it is called the "Parmesan of Mexico," and is ideal for grating; available in most Latin markets.
Cuitlacoche is corn smut, a type of fungus that invades the growing ears of corn, causing the kernels to swell into gray or blue-black masses. Known as the "truffle of Mexico", it is considered a delicacy and has the same uses as mushrooms, with a much more complex flavor. It is available fresh or canned.