Here where it's native, a few companies make various products, like flavored cookies, crackers, rusks, teas, "carob honey" (viscous extract, like sweeter, less sour, but slightly tart balsamic), and sometimes just dried carob itself, as a snack.

Most of these are kind of a novelty, mostly appealing to tourists as something new and weird, but some of them can be very tasty, and have extremely rich flavors.

Stuff for dogs and suchlike, who chocolate would kill!

-- Frost

Animal feed, I've picked carobs that got ground up and mixed with bran to feed the animales

Candy. It is a substitute in that you'd use it in most of the places you'd use chocolate. I wouldn't even attempt carob milk though.