The terms "hotdish" and "casserole" are often used interchangeably, but there are some regional differences. A tater tot hotdish is a term commonly used in the Midwest. You'll see it particularly in Minnesota, to describe a one-dish meal that includes a starch (like tater tots), meat, and vegetables, all bound together with a creamy sauce or soup. A tater tot casserole is essentially the same dish, but the term "casserole" is more widely used across the United States. Both are hearty, comforting meals that are baked in the oven.