https://screenrant.com/star-trek-ds9-armin-shimerman-max-grodenchik-tng-ferengi-roles/

Quark and Rom were main characters on Star Trek: Deep Space Nine (https://screenrant.com/db/tv-show/star-trek-deep-space-nine/), but Armin Shimerman and Max Grodenchik first appeared on TNG in different roles.