Seal Team 4 Frogman Challenge Coin. The item “Navy Seal Team 4 Frogman Challenge Coin” is in sale since Sunday, March 31, 2019. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “maar23″ and is located in San Diego, California. This item can be shipped to United States.