Melt chocolate over a double boiler (or in the microwave, if you prefer) with coconut oil. Stir until smooth, glossy, and entirely melted.
Insert a popsicle stick into one end of each banana piece. Dip each banana into the warm melted chocolate. Shake off excess chocolate as best you can.
Place dipped bananas on a parchment lined baking sheet. Sprinkle generously with chopped pistachios, chopped almonds, or cocoa nibs. Place in the freezer to harden and set.
When frozen through wrap individually or enjoy immediately.