Is there any porting of Love2D http://love2d.org/ game engine to iPhone/iPad?
Yes! You can find the iOS download (love-[version]-ios-source.zip) on the Bitbucket download page. It includes documentation on how to use it.
Unfortunately, not yet. The reason might be that Apple only allow static libraries on the iPhone.
Source: http://love2d.org/forums/viewtopic.php?f=3&t=2023&p=20788&hilit=iphone#p20788