I used carob powder in baking for many years when my children were little.
I had no idea locust bean and carob bean were the same thing. “Locust bean gum” is listed as an ingredient in food products such as ice cream.
It’s probably for a similar reason that they also use seaweeds in ice cream:
http://www.molecularrecipes.com/hydrocolloid-guide/locust-bean-gum-lbg/