Fromis 9 is already in Latin letters, so the romanization is:
Fromis 9
(However, if you're referring to the Korean name 프로미
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Fromis 9 (Korean: 프로미스나인; styled in snake_case as fromis_9) is a South Korean girl group. The group consists of five members: Song Ha-young, Park Ji-won, Lee Chae-young, Lee Na-gyung, and Baek Ji-heon. Originally a nine-piece group, Jang Gyu-ri departed the group in July 2022, and Lee Sae-rom, Roh Ji-sun, and Lee Seo-yeon departed in February 2025. Since their formation through the 2017 reality show Idol School, the group has experienced multiple management changes. — 영문 출처: Wikipedia