Unusual horse shoes

I have a couple of questions concerning some metal bog shoes, are these
also 
used as snow shoes for horses?  Is there a difference between bog shoes
and 
mud shoes, or are they just different names for the same thing?  The bog 
shoes in question can be seen at the site below, please scroll down to 
number 1347:

http://puzzlephotos.blogspot.com/2008/07/set-239.html

Thanks for taking a look.

Rob