Unroll Fruit Roll-Ups fruit flavored snack rolls; remove paper. Wrap each apple slice with 1 fruit flavored snack so side of slice with peel is smooth.
With kitchen scissors, cut 2 long, tongue-shaped pieces from remaining Fruit Roll-Ups fruit flavored snack.
Spread 1 side of each apple slice with peanut butter. Place 1 end of tongue-shaped pieces on 2 of the apple slices. Arrange 4 marshmallows on top of the peanut butter on each of these slices.
Place remaining apple slices, peanut butter side down, on top of the marshmallows. Squeeze apples slices gently together.