I have only tried chocolate eclair (The French dessert)but this one sound interesting...
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CHOCOLATE ECLAIR CAKE

Melt 1 stick unsalted butter or margarine in saucepan. Stir in 1 cup sugar,
1/2 cup cocoa, and 1/4 cup milk. Bring to boil over medium-high heat. Boil
for 1 minute, stirring constantly, Set aside.

Beat 3 cups milk and two 3.4 ounce packages instant French vanilla pudding mix
until thickened. Stir in one 8-ounce container Cool Whip and set aside.

Lay enough graham crackers side by side to cover the bottom of a 9 x 13 inch
baking pan. Spread half of the vanilla filling over the crackers. Place as
many as the remaining crackers as necessary to form another layer over the
pudding. Top with the remaining pudding. Spread the chocolate frosting over
the pudding. Chill overnight.