What's the plural form of folk-lore? Here's the word you're looking for.
Answer
The noun folk-lore can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be folk-lore.
However, in more specific contexts, the plural form can also be folk-lores e.g. in reference to various types of folk-lores
or a collection of folk-lores.