translation-based vs official localization character name of starseed

Can I change the translation-based to official name of starseed characters?

for example, snow_frill to snopril.

Sure, you can do that using bulk update requests. Click the "Request alias/implication" button at the top of the page to get to the page where you make them. After making them, they will be approved by an admin if they're good to go.