Same way people did...

Han dies > maggots eat corpse > maggots turn to flies > Toads eat flies![]()
This. It's really not that complicated...Everyone could have used Chakra, but as Madara said, in the beginning no one even new what was Chakra.
The Sage, a Chakra user, started teaching people to use it, meaning the Toads, like everyone else, learned.
Same way people did...
Han dies > maggots eat corpse > maggots turn to flies > Toads eat flies![]()
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