Pulse the almonds, oil, sweetener, vanilla, zest and salt in a food processor until coarsely smooth. Remove half to a small bowl and stir in the cocoa powder.
Fill half of one of the liners with the vanilla mixture and then quickly fill the other half with the chocolate mixture. (It should remind you of a black and white cookie.) Repeat with the remaining vanilla and chocolate mixture. Tap the tin on the counter a few times.
Freeze until solid, about 30 minutes. You can remove the liners if you'd like. Refrigerate in an airtight container for up to 5 days.
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