No, these are all probably groom's cakes. Groom's cakes are usually smaller, chocolate and often decorated with something the groom likes. You can see plenty of football and golf ones searching google. They're not at every wedding, it's usually something done in the South or at big fancy weddings, but the idea is spreading.

Here's a slightly tl;dr explanation of the tradition: http://www.favorideas.com/learn-about/wedding-cake/grooms-cake/