any seed, grain, can be sprouted. just look up what they can eat and sprout it. I am sprouting chickpeas and have done sunflower seeds, wheat berries, rye, bird seed like in the photo, wild bird feed, popcorn. Only thing I can't sprout is oats and rice. Rice is sproutable too supposedly but...
grit is for carving up the hard grain so no.
I sprout grains. That way the nutrition is boosted 100% Only takes 3 or four days. Grass would take long time