I can't be the only one to run into this problem, but the chest with the line, "Do you want to build a..." Is glitched. Snowman does not work for it for some reason. I've tried snowmen as well.
I think you should type in all caps for it to work
THANK YOU. That damn thing was driving me crazy. It's weird because others don't need all caps.
It helps to actually pay attention to the notes. They say on them that the keyboard is in caps.