place the Oreos in a food processor and pulse until they are fine crumbs
remove 1/4 cup and set aside
add the remaining crumbs into a medium mixing bowl and combine with the melted butter
pour crumb mixture into a deep dish 9 inch pie plate, spread them out into an even layer on the bottom
using a large spoon or measuring cup work the crumbs up the sides of the pie plate creating the crust
set aside
combine the marshmallows and 1 cup of the heavy whipping cream in a large pot over medium heat, stirring constantly
once marshmallows are melted completely remove from heat and pour in the creme de cocoa and creme de menthe. Make sure that the creme de menthe is fully mixed in
set marshmallow mixture aside to cool for 10 minutes
while that cools beat the remaining heavy whipping cream until stiff peaks form
pour a third of the marshmallow mixture onto the whipped cream and fold in
repeat two more times until all is incorporated
pour into the pie crust shell
top with remaining Oreo crumbs and then place in the freeze uncovered
after an hour cover the pie and allow to continue to freeze until solid