Preheat oven to 375°F. In a small bowl, mix the sugar and cinnamon together.
Unroll the crescent rolls and spread the butter evenly on each roll. Then sprinkle the sugar and cinnamon mixture on each roll.
Roll up the crescent rolls, starting with the flat end rather than the pointed end.
Place the rolled-up crescent rolls into a 9 x 11-inch baking dish. Separate them to give them room for rising during baking. Mix the cream and vanilla together and pour the mixture around the cinnamon rolls. Do not pour it directly onto the rolls.
Bake for 9-11 minutes or until golden brown.
Frosting
Add the melted butter, powdered sugar, vanilla, cream, and salt to a small bowl. Stir until well mixed.