There are many kinds of Swiss rolls.  From chocolate Swiss roll with a vanilla buttercream filling to a Yule Log, the kind of cake you see around Christmastime, to a pumpkin roll that bakers love to serve at Thanksgiving. The filling is usually a kind of buttercream, a combination of jam or chocolate ganache and whipped cream, or Chantilly cream (which is really just a fancy name for whipped cream). Some bakers even put sliced fruit inside their roll cakes.