Hahaha! They are called “nasolabial grooves” and through capillary action it helps move odor particles towards the vomeronasal organ. They tap their snout on surfaces to collect odors and pheromones.

It makes a lot of sense when you think about it. These salamanders belong to the “Lungless Salamander” family. They can’t rely on their lungs to pull-in the odor molecules, so they have to rely on a different trick!

Some more info here: www.britannica.com/animal/lungless-salamander