Preheat the oven to 350°F then lightly grease a loaf pan.In a large bowl, combine the spelt flour, baking powder, baking soda, salt, cinnamon, ginger, coconut, and chopped nuts. Sift together. Add the shredded carrots to the bowl (without stirring) then set aside.In the bowl of a blender, combine the banana, pure maple syrup, vanilla extract and milk. Blend on high until smooth. Alternatively, you can mash the banana by hand and combine the ingredients in a bowl. Try to get it as smooth as possible if not using a blender.Pour the wet ingredients into the bowl with the dry. Add the melted coconut oil last then stir everything together just until combined. Transfer the batter to the loaf pan and bake in the preheated oven for 45-50 minutes.Meanwhile make the icing by combining all of the ingredients (starting with just 1 tablespoon milk) in a high speed blender and blend until smooth. Scrape down the sides in between blending. Add more milk, as needed, to thin and more salt or sweetener as desired.Allow the loaf to cool for 30 minutes to an hour. Once cool, spoon the frosting on top. Sprinkle with chopped nuts and coconut, and enjoy!