In a blender, blend together the yogurt, peanut butter, bananas, and vanilla. Add a pinch of salt. Blend until completely smooth and creamy. If needed to thin the mix (if it feels too creamy) add 2-4 tablespoons milk.Evenly divide the mix between 8 Dixie Cups or popsicle molds. Insert popsicle sticks. Freeze until firm, 4 hours or overnight. Keep in the freezer until ready to eat!Melt the chocolate and coconut oil together in the microwave. Let cool 10 minutes. Remove the pops from the freezers and cover in chocolate, then roll through the pretzel crumbs. Eat or keep in the freezer until ready to eat!