As candy corn is to Halloween, and conversation hearts are to Valentine’s Day, so Peeps are to Easter. Seemingly every holiday has a divisive treat that has hobbled along in the American consciousness by virtue of its most ardent defenders. But Marshmallow Peeps, the flagship product of Just Born Quality Confections, seem to proliferate more and more every year, spawning new flavors, shapes, and spin-off products to the delight of some and the horror of others. If you’ve never had the pleasure/misfortune: Peeps are chick-shaped marshmallows coated in colorful sugar and dotted with two teeny chocolate pinprick eyes. They inspire...