Special equipment: a 9-by-5-by-3-inch loaf pan
Combine the corn kernels and cream in a medium saucepan over medium heat. Break the corn cobs into pieces and add them to the pot. Bring the mixture to a simmer, then reduce the heat to low. Gently simmer the mixture 15 minutes, stirring occasionally, then remove from the heat and let cool completely.
Discard the corn cobs and pour the rest of the cream mixture into a blender. Blend on high until mostly smooth, about 1 minute. Strain into a bowl and refrigerate until cold, 1 to 2 hours.
In a stand mixer fitted with the paddle attachment, whip the cream mixture on high speed until it forms soft peaks, 1 to 2 minutes. (Note that this will not whip to quite the volume of regular whipped cream because of the corn, but it will get to soft peaks.)
Whisk together the sweetened condensed milk, vanilla and salt in a large bowl. Fold about half of the whipped cream mixture into the sweetened condensed milk mixture with a rubber spatula, then fold the lightened mixture into the whipped cream until well blended. Pour into a 9-by-5-by-3-inch loaf pan and cover with plastic wrap. Freeze until firm, about 4 hours.
To serve, scoop into glasses or bowls and garnish with caramel coated popcorn, if desired.
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