No. Adobe has never released an official portable version of Premiere Pro. Any "portable" version found online is an unofficial, cracked, or modified copy that violates Adobe's terms of service and copyright laws.
iMovie is entirely free for Mac users, while Final Cut Pro offers a generous multi-month free trial. adobepremierepro20222262dmg portable
"Portable" versions are modified by third parties to run without a formal installation process, often from a USB drive. Risks of Using Portable Versions adobepremierepro20222262dmg portable