Kangaroo Protection Act of 2021 This bill establishes new federal crimes related to commercial activities involving kangaroos and kangaroo products. Specifically, the bill prohibits the import for commercial purposes, possession with intent to sell, or sale of a kangaroo; and the introduction into interstate commerce; manufacture for introduction into interstate commerce; sale, trade, or advertisement in interstate commerce; or offer to sell, or transport or distribute in interstate commerce, any kangaroo product. A violator is subject to civil and criminal penalties. Additionally, a kangaroo or kangaroo product used in a violation is subject to forfeiture.