FTG Naruto's father Minato creator originated from a Uzumaki reverse summoning seal.I think we seen Naruto use this seal when he was fighting pain,he reverse summon his clones for sage mode.The frog dude said Naruto found a way that works for him, meaning Naruto came up with the idea.i know the frog did the reverse summoning, but Naruto was going to do it pain wouldn't let him so i think Naruto knows how to do the reverse summoning technique at the very least.Plus this could be that jutsu that Jiraiya and the key scroll were talking about.I can't see much of a differences between the reverse summoning technique that Naruto did and the 3 man FTG technique that the hokage staff did.