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There's a chance to return to the Inn halfway through the jungle, after you rescue li'l Kuno (the blue guy) from the river. The game should tell you that it's your chance to stock up before you continue.

If you've already set off on your journey with him though... you've missed your chance, I'm afraid...

If you're struggling with the big guy, I recommend searching around in the jungle area before heading into the wall. There should be a cleansing spring that can at least have you fighting-fit before you go to the boss.

Either way, good luck!