In a medium bowl, stir together the Greek yogurt and pudding mix. Fold in the diced strawberries.
Line a plate or baking sheet with parchment paper. Drop 16 spoonfuls of the mixture onto the parchment, creating small mounds.
Freeze for 1–2 hours, or until the clusters are firm.
Melt the sugar-free chocolate in the microwave at 50% power in 20 second intervals, stirring between each interval.
Drizzle the melted chocolate over the frozen clusters.