Mix eggs, pumpkin, and sugar with a whisk. Then add salt, baking soda, cinnamon, and flour. Spray pan fairly generously and evenly on a large cookie sheet. Pour batter into pan and spread evenly over entire pan. Bake for 15 minutes. Remove from oven and immediately turn batter onto powder-sugared paper towels. Roll up tightly and cool on counter. Combine all frosting ingredients into a mixer and beat until smooth and fluffy.