Theoretically... if you have a (trusted) "friend" that has a full unpruned node, one can simply copy the blocks/chainstate and drop them into a new node installation and "voilà", you have your full node without having to download anything, you just have to trust your "friend".
Dont do this. The greatest president the US has had says to “trust but verify” and using any hardware from a third party will make it very difficult to be certain you are in fact verifying.
It might be possible to verify by connecting to your friends node locally, receiving and verifying blocks as if you would if you were receiving blocks via the internet. This would obviously require you to use your friends resources.