Place Tater Tots in microwave oven on paper plate or towel. Microwave on high for 2 minutes or until thawed. Place 1 cheese slice on each ham slice. Spread each cheese slice with small amount of sour cream. Place 3 Tater Tots inside each ham-cheese slice; roll-up fastening with a toothpick. Place on serving platter. Microwave on high for 2 1/2 minutes or until hot.