Yes, squirrels can eat oatmeal of any kind. Oatmeal is a healthy choice of food for squirrels as it comprises a significant source of nutrients for both humans and squirrels. It contains potassium, vitamins, minerals, antioxidants, probiotics, proteins, and fibers which are necessary for the overall well-being of a squirrel. Also, ensure that you feed them with cooked oatmeal instead of uncooked oatmeal.