(Photo via redditor iBleedorange)
These are trdelník. They are pastries from the Czech Republic and Slovakia. Street Food around the World: An Encyclopedia of Food and Culture describes them as a sweet dough made into long strands, then wrapped around wood or metal rods, then baked while rotating over an open fire. They're often coated with sugar, cinnamon, or nuts after baking.
In this case, an unknown genius has filled the hollow pastry with chocolate sauce and soft serve ice cream!