"折叠式印刷品" can be translated as "folded printed matter" or "folded print publications" in English.
"Folded printed matter" emphasizes the folded nature of the printed item.
"Folded print publications" is slightly more specific, suggesting that the item is a type of publication (such as a brochure, pamphlet, or leaflet) that has been folded.
Choose the phrase that best fits the context in which you are using it.