Beat whipped topping, marshmallow fluff, and cream cheese together until smooth and fluffy, then top with sanding sugar.
Dip Oreos halfway in melted white candy wafers and let set on parchment.
Pipe melted green wafers onto the Oreos in tree shapes and decorate with sprinkles.
Dip vanilla wafer bars halfway in melted chocolate wafers, then add pretzel antlers, candy eyes, and an M&M nose.
Let all the candy pieces set completely, then arrange the dip, reindeer, and Oreos on the board.
Fill in remaining space with Christmas Tree Cakes, strawberries, raspberries, grapes, and M&Ms.