The first one is clear – yellow turnips or beets (Rüben).
The second one means ‘turnip lights’, because they aren’t eaten, but hollowed out by children as lanterns.
See the very nice pictures on flickr. Procession is on St. Martin’s Day, November 11.
Or so I was told in St. Gallen. I also saw a copy of something I think I’ve seen in a book before – a very early diagram of an ideal monastery, the St. Galler Klosterplan (website in German and English).