Heat oven to 425. Lightly spray a baking sheet w/ cooking spray.
In medium bowl, stir chicken, cream cheese, 1/2 cup salsa, and mexican cheese.
Unroll pizza dough onto lightly floured surface. Roll dough into a 12"-square rectangle. Cut dough into 4-6"-squares. Place 1/2 cup chicken mix on 1/2 of each square. Fold dough over filling, pressing edges w/ fork to seal. Place calzones on baking sheet. Bake 12 min, or until golden. Serve w/ remaining salsa and sour cream for dipping. Or place salsa and sour cream on top of calzones before serving.