The difference between Cock-and-bull story and Tall tale
When used as nouns, cock-and-bull story means a far-fetched and fanciful story or tale of highly dubious validity, whereas tall tale means a greatly exaggerated, fantastic story.
check bellow for the other definitions of Cock-and-bull story and Tall tale
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Cock-and-bull story as a noun (idiomatic):
A far-fetched and fanciful story or tale of highly dubious validity.
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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."