This is the 877th most frequent Polish word.
małopolski
"Małopolski" means "related to Lesser Poland," a historical region in Poland.
In this sentence, 'małopolski' is used in the adjectival form to describe the 'region', indicating that the region belongs to or pertains to Małopolska (Lesser Poland).
Region małopolski jest bogaty w historię.
The Małopolska region is rich in history.
Here, 'małopolskie' modifies 'muzea' (museums) to specify that the museums are located in or associated with the region of Małopolska.
Odwiedziliśmy małopolskie muzea pełne cennych eksponatów.
We visited Małopolska museums full of valuable exhibits.
In this usage, 'małopolski' describes 'folklor', identifying it as associated with Małopolska, focusing on regional customs and traditions.