In a large bowl, combine the first eight ingredients. Stir in mayonnaise. Unroll both tubes of crescent roll dough into one long rectangle. Place on an ungreased baking sheet. Roll into a 15x12-in. rectangle, sealing seams and perforations. Spoon chicken mixture down center third of dough.
On each long side, cut eight strips about 3-1/2 in. into the center. bring one strip from each side over filling and pinch ends to seal; repeat. Brush with egg white. Sprinkle with almonds. Bake at 375° for 15-20 minutes or until filling is heated through and top is golden brown.