Arrange the vanilla wafers bottom-side up on a baking sheet lined with parchment. Fold the sesame seeds into the sorbet. Scoop 1 tablespoon of the ice cream mixture on 12 of the cookies. Sandwich with the remaining cookies and freeze to harden, about 2 hours.
Stir 1 teaspoon of the canola oil into the melted dark green candy and the remaining 1/2 teaspoon canola oil into the melted light green candy to thin.
Clean up the edges of the ice cream sandwiches with a paring knife. One by one, dip the sandwiches in the melted dark green candy. Use a small rubber spatula or fork to drizzle the melted light green candy over the sandwiches to add stripes. Freeze to set before serving, about 30 minutes.
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