Jack-o'-Lantern "Cake"

Ingredients

• 1 pkg. (2-layer size) yellow cake mix
• 1 pkg. (3.4 oz.) vanilla instant pudding mix
• 1 pkg. (8 oz.) brick cream cheese, softened
• ¼ cup butter, softened
• 1 tsp. vanilla
• 4 drops yellow food coloring
• 1 drop red food coloring
• 1 pkg. (16 oz.) powdered sugar, sifted (about 4-1/4 cups)
• 1 Tbsp. green colored sugar
• 5 OREO Cookies, divided
• 2 miniature marshmallows, cut in half