Choco Pie isn't like "chocolate pie" in the Western vernacular. It's a knock-off (of a knock-off) moon pie. [1]
> In the wake of World War II and the Korean War, the snack gained popularity in East Asia through its introduction by American GIs. Starting in 1958, a similar type of marshmallow filled cake was developed by Morinaga in Japan as 'Angel Pie'.
> Tongyang Confectionery began selling a similar product known as 'Orion Choco Pie' in 1974.
> In the wake of World War II and the Korean War, the snack gained popularity in East Asia through its introduction by American GIs. Starting in 1958, a similar type of marshmallow filled cake was developed by Morinaga in Japan as 'Angel Pie'.
> Tongyang Confectionery began selling a similar product known as 'Orion Choco Pie' in 1974.
[1] http://en.wikipedia.org/wiki/Choco_Pie