Adarin sandworms! A staple of diets across the desert! They're lacking in flavor and even more lacking in actual nutritional content, but at least they're easy to catch. Just stab randomly at the ground! When you can't catch or afford anything else, there's always sandworms. The Adarin equivalent of Top Ramen, if you will.

...Kepfera eats a lot of sandworms. :I

and no, the worms don't really get bigger than this. in before dune references.