To make the pecan milk (latte) with the pecans: soak pecans in water overnight. Discard the soaking water and blend the pecans with 1/4 cup fresh water). Pour and squeeze pecan milk through a strainer cloth (e.g. cheese cloth, muslin, or double wrapped mesh bag) over a bowl or glass. Save the blended pecans as the "pecan butter" for the smoothie.
Make the pecan milk foam: Add some of the fresh pecan milk made into a stove pot on medium high heat until small boils. Turn off stove and use frother tool to make foam from the warmed milk. Reserve foam for the top of drink.
Make the smoothie drink: Add all ingredients (except for the milk foam) to a blender and blend smoothly. Pour into a drinking glass.
Spoon foam that can be made from fresh pecan milk (or milk blend) to the top of the drink.