1. Stir together first 4 ingredients. Shape mixture into a ball to resemble a pumpkin. Smooth pumpkin's entire surface with metal spatula or table knife. Make vertical grooves in ball, if desired, using fingertips. Press pretzel into top of cheese ball to resemble a pumpkin stem; place muscadine vine and leaf beside pretzel. Serve with crackers and assorted vegetables.
*Extra-sharp Cheddar cheese may be substituted.
Note: We tested with Cracker Barrel Extra-Sharp Cheddar Cheese. To make ahead, wrap cheese ball in plastic wrap, without stem, vine, or leaf, and store in refrigerator up to two days. Attach stem, vine, and leaf before serving.