There were several attempts for that. The most recent one is PhotoGIMP, which is actually a patch and not a port. Before that, there used to be Gimpshop, but the dude behind it got fucked over by someone who bought a dotcom domain with that name and served ad and spyware. Though, ever since the major gui rework several years ago, i don't see much of a point. It is a different software, no matter how much you try to cover it up, the functionality and workflow will always be different. And most other commercial software don't constantly try to copy some other software either.