Add ¾ cup (165 grams) cream cheese frosting to a piping bag fitted with a star tip.
In a small bowl, mix 3 tablespoons of cream cheese frosting with the pink food coloring, then transfer to a small piping bag fitted with a small round tip.
Add the remaining cream cheese frosting to a medium bowl and mix with the orange food coloring until the desired shade of orange is reached. Transfer to a large piping bag fitted with a star tip.
Holding the piping bag upright, pipe the orange frosting in a circle around the edge of a cupcake, then fill in the center. Pipe 2 slightly larger mounds of frosting on the top corners of the cupcake as ears.
Place 2 white chocolate wafers adjacent to each other at the bottom center of the cupcake, then nestle 2 mini marshmallow halves slightly under the space where the wafers meet as hamster teeth. Using the white cream cheese frosting, pipe a dime-sized mound where the 2 wafers meet and a small dot in the center of each ear. Pipe a dot of pink frosting on top of the white mound as the nose. Place 2 nonpareils above the wafers as eyes. Repeat with the remaining cupcakes.