Tongues are used for tasting things! haha
Your tongue is used to aid in digestion. It also contains tastebuds that are responsible for part of our sense of taste.
Genioglossus
A tongue scraper is used to clean the bacteria build up on the tongue. They are shaped in accordance and designed to lift the plaque coating better than using a simple toothbrush.
they use it to find heat sources, like snakes