I would 100% agree! I went to Google Images and it looks exactly like the one I saw. I also searched up its mating call on YouTube, and it sounds identical to the call I've been hearing every night for the past couple of days. Thanks again!
@birdsandbats Seems like there's some taxonomy issues going on. Some sources show one range and others show a different one. Apparently call is one of the best ways to distinguish them, so @EternalPigeon maybe look up calls of both and see which matches.
@Great Argus Yeah, this genus recently underwent some taxonomy changes, Amphibian Species of the World currently lists any of these seen in Missouri as Boreal.