Line a cookie sheet or a baking tray with parchment paper. Set aside
In a mixing bowl, add the cake crumbs, and half of the frosting. Mix using a spatula. Make sure the cake crumbs and the frosting come together and bind. Note: You may use little or more frosting as per requirement. The main idea here is to be able to bind so as to make truffles out of it.
Use a small scoop or a tablespoon, scoop out and make small balls. Line them on the cookie sheet. Put it in the refrigerator for about an hour before dipping them in chocolate.
Bring the truffles out of the refrigerator. Melt Chocolate. Dip the cake balls into the melted chocolate, shake off excess chocolate and line them back on the cookie sheet/baking tray. Let it set completely. Put it in the freezer for about 10 to 12 mins.
Using the remaining melted chocolate and pipe them on to these truffles. Note: you may use a different chocolate too, to pipe and decorate these truffles. like white or milk chocolate or coloured white chocolate.
Notes
The number of truffles, will depend on how big each of the truffles are.
Do not use whipped cream as your frosting, it will be too moist to bind and form balls.