These are little pretzel sticks without any salt on them, topped by a chunk of fairly dark chocolate.
The pretzel stick part is pretty tasty and goes well with chocolate, which tastes more bitter than standard milk chocolate but I would not class it ac being actually dark chocolate as it does not taste harsh
I can definitely see why these are popular! But do be careful as mine arrived quite melted so the mushroom heads were all stuck together in a mass of pretzel-y goodness