Mix water/yeast. Cover and let it rest for 10 minutes or until it is foamy.
Mix dry ingredients together. Add water/yeast mixture, oil and pumpkin puree to dry ingredients and mix until a soft dough forms. Turn out onto lightly floured surface and knead until smooth.
Brush bowl with oil or spray with non stick cooking spray and return dough to bowl. Cover loosely with a towel and let raise until doubled, about an hour.
Preheat oven to 425 degrees.
Make a bath for the pretzels by combining the baking soda with HOT water in a bowl and stirring until soda is mostly dissolved (it won't dissolve completely).
Roll out dough into a long rectangle (about 12"x24"). Using a pizza cutter, cut into small bite-sized sections. Dip each dough square into the water/soda bath, allowing excess to drip off, and place on a greased baking sheet.
Bake for 4 minutes, then rotate pan and bake another 4 minutes.
Brush pretzels with melted butter. Sprinkle liberally with cinnamon and sugar.
Whisk icing ingredients together. Drizzle over cooled pretzel bites or use as a dipping sauce.