The best alternatives to Roll are Slingshot, Camera Club, and SlickPix. If these 3 options don't work for you, we've listed a few more alternatives below.
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Slingshot allows users send a photo or video with text or drawings to another person. The recipient, however, can not open the picture without acknowledging that they want to open it and “sling” another image back to the initial sender.
Camera Rollette is a social game where you exchange random camera roll image with your friends. The iOS app lets you and your friends take turns exchanging randomly selected images from your camera rolls. The goal of the app is simple: have fun.