Frog_(patience)
Frog (also known as Toad) is an old French patience or solitaire card game which is played with two decks of playing cards. It belongs to the same family of solitaire games as Strategy, Sir Tommy, Calculation, and Puss in the Corner. Game-play is like Sir Tommy, but with two decks, a fifth waste pile, and a Canfield-like reserve (referred to as the 'Frog'). In its native France it is known as Le Crapaud ("The Toad").
It is one of the few solitaire games that relies almost entirely on skill.[1]