Ofc it's possible if you got the right tactic + some rng luck.
Myself is stuck at 73, as lvl 57.

For you stuck at Jiraiya, you need a lot of clones to let them, take the frog's auto hits.
But you need to kill him before his jutsu in 2nd round, so it's a dmg race :lol
Tried to drain his chakra with shino, but it don't really work, it's all about dmg.

For the frog, I used Naruto 3*, Sai & Guy, but I'm Earth... so a bit burst cheat with inner gates ;P