Add the oats to a blender, cover and blend to a fine powder. Add 2 ice cubes, banana, coconut milk, lemon juice, vanilla and 1/8 teaspoon salt, cover and blend until smooth. Add the mango and pineapple, cover and blend until smooth, at least 1 minute.
Pour the smoothie into two large chilled glasses and garnish with a pineapple wedge.
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