Yes it is known as Black Hairy Tongue

The tongue will also look fuzzy. This is because the little fuzzy bits we normally have on our tongue, called papillae, haven’t been shedding the way they usually do, so they appear longer.

Why people get black hairy tongue
Those papillae on our tongue normally wear away at about the same rate they grow. In the same way that our skin constantly sheds dead cells, our tongue sheds its own cells during the course of everyday life. We lose a few cells every time we eat, for example.

But if you have black hairy tongue, those cells aren’t getting rubbed off, and you may have bacteria or other microorganisms growing on the surface of your tongue, changing the color.

Black hairy tongue is more likely to be an effect of other health conditions or personal care issues than a cause. For example, if you have dry mouth due to medications or if you’ve been eating a liquid or soft diet, you’re more likely to develop black hairy tongue. Tobacco, alcohol, and coffee or tea can also contribute, according to Mayo Clinic.

IT IS NOT THE CAUSE OF HER DEATH-SHE DIED OF CARDIAC ARREST.