Rolling Thunder Game Wood Duck Whistle Game Call Ducks Frost. It features a durable one-piece acrylic design with metal guts built to last a lifetime. The Wood Duck Whistle is constructed in the vintage Olt D-2 style inspired by passion for all things cutdown and is a great lanyard compliment to any of our mallard calls. Specifications for Rolling Thunder Game Wood Duck Whistle Game Call: Manufacturer: Rolling Thunder Game Color: Frost Fabric/Material: Acrylic Species: Duck Package Contents: Rolling Thunder Game Wood Duck Whistle Game Call Rolling Thunder Game DC016CF: Wood Duck Whistle Game Call Ducks Frost