We have the old single jaffle iron which you put on the stove (4th pic down in the left column). The "real" ones my parents had were round rather than pandering to modern square bread, and for entertainment we would cook with them by sticking the end in a fire, which is for what they were originally designed. Much better than a toasted sandwich because the contents get hotter and nothing drips or falls out while eating.
Actually, a jaffle is different to a toasted sandwich, because the jaffle iron squashes the edges of the bread together, sealing them (hopefully!). So the end product is akin to a pie. Modern electric "snack makers" are similar except they're electric, not designed to put in the fire