Absolutely! In fact, the original tater tot casserole recipe, that came out of Minnesota in 1956,  included green beans. So really, replacing the corn in the casserole with green beans is a way to honor the founding midwest recipe. Just remember, to truly honor the Norweigan heritage of the Minnesota recipe, it is no longer a “casserole.” It has transformed into a tater tot “hotdish” with green beans.