Bake the cake: Preheat the oven to 350°F. In a large bowl, mix the cake mix, water, oil, and eggs until smooth. Pour into a 9×13 pan and bake for 30 minutes. Let cool completely.
Prepare the cake mixture: Crumble the cooled cake into a large bowl. Mix in the vanilla frosting until fully combined.
Form truffle balls: Roll 1 tablespoon of the mixture into a ball and place on a parchment-lined baking sheet. Repeat with remaining mixture. Refrigerate for 30 minutes.
Melt the coating: Melt the vanilla almond bark according to package instructions.
Dip the truffles: Using a toothpick or skewer, dip each truffle into the melted almond bark, tapping off excess. Place on parchment paper to set.
Decorate: Drizzle extra melted almond bark over truffles and top with a royal icing carrot.
Set and serve: Allow truffles to set for about 15 minutes before serving.