Naruto
jiraiya the toad sage
when jiriya died fighting pain naruto started to train to surpass him in the toad mountin
He travel to the toad mountains in Naruto Shippuden 154 to learn sage mode
YES! yes he does. The toad sage, master fukasaku, teaches him at mount myoboku. (in shippuden)
Apparently yes, as he begins to train for it in the few last chapters.
pein used rennegan
sage mode
Naruto becomes a sage after he finds out that the pervy sage had died nd the elder frog that trained him uses toad oil and naruto becomes a sage he uses this power to fight pain,
It is unclear whether the fourth even was a sage or not. If he was, it would be safe to assume that Fukasaku and Shima were his safe toads.
no jiraiya is he is one of the three sannin (shinobi three) however he does teach naruto some toad jutsus and naruto becomes a toad sage.
they won't give it to you cause they dislike you
Naruto looks cooler because he master what Jiraiya couldn't. Naruto completely mastered the sage mode but Jiraiya couldn't so he developed some toad features when turned into a sage.