Crumble the cooled cake with a mixer or by hand. To the crumbs, add 2 heaping Tbsp of the frosting and mix to combine thoroughly.
Test to see if the amount is correct by rolling a bit of the mixture between your palms. If it rolls into a ball that stays together, you're good. If not, add a bit more frosting, a little at a time, until it's easily rolled into balls.
Scoop the mixture using a cookie scoop or Tbsp measuring spoon, then gently roll it between your palms until it forms a ball.
Add rolled cake ball to a wax paper lined baking sheet, then repeat with remaining cake balls. Add baking sheet to the refrigerator or freezer for about 5-10 minutes or so.
While cake balls are chilling, add the chocolate to a bowl and melt the white chocolate in whichever method you prefer (see chef tip #3 below). Add some of the chocolate to a squeeze bottle, piping bag, or plastic bag with the corner snipped off. Leave the rest in the bowl.
Pierce a cake ball on a fork, then dip in the melted candy coating. Gently tap the fork on the edge of the bowl to remove excess coating, then place back on wax paper lined baking sheet.
Drizzle the cake ball with additional white chocolate from the squeeze bottle, then sprinkle with reserved crushed freeze-dried raspberries.
Repeat with remaining cake balls, then return baking sheet to the refrigerator for about 15 minutes.