I bought iPhone 14 pro in January 2023 and and after 6 months battery got swell and screen popped up. So can I get replacement on this?

The Apple Limited Warranty covers your iPhone and the Apple-branded accessories that come in the box with your product against manufacturing issues for one year from the date you bought them.

Please check the link below, it has useful information to help you to resolve the issue that you are having:

iPhone Battery Repair & Replacement - Apple Support