The difference between Shaggy dog story and Tall tale
When used as nouns, shaggy dog story means a long-winded joke or tale featuring the narration of typically irrelevant details, and usually ending with an absurd or pointless punchline which is often a pun or spoonerism on a known catchphrase, whereas tall tale means a greatly exaggerated, fantastic story.
check bellow for the other definitions of Shaggy dog story and Tall tale
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Shaggy dog story as a noun:
A long-winded joke or tale featuring the narration of typically irrelevant details, and usually ending with an absurd or pointless punchline which is often a pun or Spoonerism on a known catchphrase.
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Tall tale as a noun (idiomatic):
A greatly exaggerated, fantastic story.
Examples:
"He returned on Monday with a tall tale about a 100-pound fish he had caught."