Crush the chocolate sandwich cookies into fine crumbs.
In a bowl, beat the softened cream cheese until smooth.
Add the powdered sugar to the cream cheese and mix until well combined.
In another bowl, whisk together the milk and instant vanilla pudding mix until thickened.
Fold the whipped topping into the pudding mixture gently.
Combine the cream cheese mixture with the pudding mixture until smooth.
In a trifle bowl, layer half of the cookie crumbs at the bottom.
Add half of the pudding mixture over the crumbs.
Repeat the layers with the remaining crumbs and pudding mixture.
Top the cake with chocolate sprinkles, gummy worms, and edible grass for decoration.