Hi,
Your best bet is to find a picture of both. Camels have a distinct hump on the back and have red & white stripes. Peppermints don't have a pronounced hump and have red & clear stripes on their bodies. Peppermints don't really have any distinct white stripes and can appear almost see through at times. Camels have brighter red coloring on their bodies. Camels, of course, aren't reef safe. Peppermints are reef safe in most situations but have been known to develop an appetite for certain polyps.
HTH, Laura