Bart borrows $20 from Homer for a church donation but Homer's relentless badgering for payback, forces Bart to swallow things at school for money.
Given the decision to be the the kid who swallowed the frog and owing Homer money, he swallows the amphibian which leaves him the target of ridicule which leads him to befriend the one kid in school no one knows is even there, Diggs, who teaches Bart all about falconry.
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