The term "folk school" is correct and usable in written English.
You can use this term when referring to a type of educational institution, usually associated with 19th century Europe, that focused on teaching practical skills and passing on traditional culture from one generation to the next. For example: "In the 19th century, many rural areas in Europe had their own folk school, where farmers could learn new skills and pass on their traditional knowledge to their children."
At eighteen, she enrolled in a Norwegian folk school and learned how to dogsled.
A variety of backgrounds and viewpoints is not only inevitable, but it also speaks to the core of the folk school ethos.
With the help of a patron, he was later able to go to school; after finishing he worked as a teacher in a Grundtvigian folk school until he became tubercular and went to Spain and Italy to convalesce.
She understood local politics and, moreover, had been encouraged by a white civil rights campaigner Virginia Durr, whose husband acted as a lawyer for the NAACP, to attend the Tennessee Highlander Folk school which taught courses on how to resist segregation.
Myles Horton, co-founder of Highlander Folk School which birthed the citizenship school movement, travelled through Denmark and was inspired by the folk school philosophy, "education for life".
Folk school traditions also inspired popular education in America such as the Highlander Folk School in Tennessee, which played a crucial role in the civil rights movement.
Rather "they were designed for specific audiences — picket lines, folk schools, party meetings".
Folk schools were emphatically not trade schools and their purpose only casually vocational.
While backpacking through Europe in the early 1970s, he had developed an admiration for the youth hostel system and the Scandinavian tradition of residential "folk schools" for adults.
N.F. S. Grundtvig, the Danish philosopher of folk schools, saw them as sites for "the fostering of all our vital efforts".
Folk schools, sometimes taking shape in colleges, were integral to farmer, labor, and free church movements among common people in Denmark, Norway, Sweden, Germany, France, and elsewhere.
