Line a baking sheet with paper towels; set aside. Attach a deep-fry thermometer to a medium-heavy saucepan. Set over medium heat, add 1 inch oil and heat until the temperature reaches 350°.

Meanwhile, in a small bowl, stir together flour, 4 tablespoons sugar, baking powder, 1 teaspoon cinnamon and salt. In a medium bowl, whisk eggs until blended. Whisk pumpkin into eggs until combined. Add flour mixture to pumpkin; stir just until combined.

Drop batter by heaping tablespoonfuls into oil, four at a time. Fry until golden brown, turning occasionally, about 4 minutes. Using a slotted spoon, transfer fritters to paper towels. To test for doneness, press lightly; fritters should spring back. (They will deflate slightly as they cool.) Repeat with remaining batter.

In a small bowl, stir together remaining 3 tablespoons sugar and 1 tablespoon cinnamon. To serve, arrange fritters on dessert plates. Sprinkle with rounded teaspoonfuls cinnamon mixture; serve with ice cream.