In a medium bowl, combine the Greek yogurt and ground cinnamon, stirring until smooth.
Gently fold in the cherries, drained fruit cocktail, and chopped walnuts, distributing them evenly throughout the yogurt.
Line a small baking sheet or a large plate with parchment paper.
Spread the yogurt mixture evenly over the parchment paper to about 1/2-inch thickness.
Freeze for at least 2-3 hours, or until completely solid.
Once frozen, remove from the freezer, break the bark into pieces, and serve immediately.
Don't be afraid to customize! Swap the walnuts for pecans or almonds, or add a sprinkle of mini chocolate chips, shredded coconut, or granola for extra texture and flavor.