Remove 6 Swiss rolls from the package and place them a few inches apart on parchment paper. Next, cut the other 2 rolls at an angle, cutting 3 pieces from each one. Set these smaller pieces aside.
Then, use a chef's knife to slice a thin piece off each end of the 6 larger rolls.
Using an offset spatula, gently spread chocolate frosting over the outside of the Swiss rolls. Take one of the smaller pieces from earlier and add a dollop of frosting to one end. Secure it to the side of a large roll. Use extra frosting to create a seamless transition between the two pieces. Pieces of the Swiss roll may break away; just discard the piece and re-frost.
Once all 6 logs are frosted, lightly run the tines of a fork over the frosting to create the look of bark.
Then, add green frosting to a piping bag fitted with a small leaf tip and pipe two leaves on each log.
Add three red pearl sprinkles to each pair of holly leaves.
Finally, dust with powdered sugar for a snowy finish, if desired.