Spoon about a teaspoon of white frosting onto a piece of parchment paper and spread into a small circle. To make the hot dog bun: Cut a vanilla wafer in half. Arrange the wafer halves cut-side down over the white frosting. Sandwich the chocolate chew between the wafer halves.
Mix white frosting with yellow food coloring in a small bowl. Transfer the yellow frosting to a pastry bag fitted with a very small round tip. Pipe the yellow frosting onto the chocolate chew as mustard. Finely chop the gummy bear and sprinkle on as relish.
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