Conversation so far:
what language did the sinhalese people use?
The Sinhalese speak Sinhala, also known as "Helabasa".
is it a widely known language?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Folk tales like Mahadana Muttha saha Golayo and Kawate Andare continue to entertain children today.
what were the folk tales about?
Mahadana Muttha tells the tale of a fool cum Pundit who travels around the country with his followers (Golayo) creating mischief through his ignorance.

Question: are any of these folks books to this day?
Self-contained rewrite: are any of the Sinhalese folks books people today?