Place the whipped topping, pudding mix, vanilla extract, and yogurt into a large bowl. Whisk together until fully combined and smooth. Cover the mixture and refrigerate until for about one hour or until ready to serve.
Wash and drain the blueberries. Wash, pat dry and slice the strawberries.
Remove cream mixture from the refrigerator and gently fold in strawberries, blueberries, and mini marshmallows, stir gently to combine.