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The Mountain is just magically sealed and Frog simply destroys the spell with the Masamune. Presumably Magus opens and closes the mountain each time he and his army crosses over. The mountain pass is always there but Magus uses a spell to close the mountain, Frog breaks that spell and the mountain re-opens to normal.
mysticalphaHobbyist Digital Artist
As far as I know, the game doesn't tell you that bit of information. There may be NPCs that tell you but the game doesn't feel it's important enough to force you to run into their conversation. Breaking Magus's spell on the mountain is most likely what the game is implying but if Frog can in fact hold the power to break Magus' spells at a flick of the Masamune, then he has the power to defeat Magus quite easily. Of course, during battles, Frog doesn't possess the same tech or epic-beam-from-the-sky ability to easily thwart his enemies/Magus. In this comic, I'm merely exaggerating that weird logic.