Make the salted cream cold foam: In a medium bowl, combine the heavy cream, whole milk, sugar, and salt. Use an immersion blender to blend until thick and foamy, about 3 minutes.
Make the iced white mocha: Drizzle the caramel sauce down the sides of a 20-ounce glass. Add the white mocha syrup, espresso, milk, and ice. Top with the salted cream cold foam and drizzle with more caramel sauce.