Combine nuts, sugar, flour, baking powder, salt and cinnamon in a large bowl, and set aside. In another bowl combine milk, squash, egg yolks and oil. With a large wooden spoon, stir the dry mixture into the squash mix and set aside. Beat the egg whites in a bowl until stiff peaks form. (Use a copper bowl for best results). Gently fold the stiff whites into the squash mixture. Heat up you skillet, and pour about 1/4 cup batter per pancake. Cook until surface is bubbly and edges are slightly dry and flip. Cook until golden brown.