Preheat oven to 350.
Spray loaf pan with cooking spray or line with parchment paper. Set aside.
In a medium bowl, combine pumpkin, sugar, pie spice and milk. Mix until blended.
In a small bowl make sugar mix by combining sugar and pumpkin spice. Set aside.
Separate dough into biscuits, then separate each into 2 layers, making 16 total layers.
Gently press each to flatten.
Brush each layer with melted butter.
Spread pumpkin mixture on top of each layer and dust with sugar mix.
Stack 4 biscuit layers together and place on side in prepared pan.
Repeat process with remaining layers.
Dust top of loaf with remaining sugar mix.
Bake 25 minutes.
Cover top with aluminum foil and bake an additional 20-25 minutes or center is baked through.
Make icing by combining ingredients and whisking until blended.
Allow loaf to cool for 15 minutes, then drizzle with icing.