Squirrel food? ... or the formal term for any of the starred plausible-yet-wrong answers

• Phrase like "all intensive purposes" or "free reign," resulting from mishearing

Wikipedia Word definitions in Wikipedia
In linguistics , an eggcorn is an idiosyncratic substitution of a word or phrase for a word or words that sound similar or identical in the speaker's dialect (sometimes called oronyms ). The new phrase introduces a meaning that is different from the original ...

Wiktionary Word definitions in Wiktionary
n. (context linguistics English) An idiosyncratic but semantically motivated substitution of a word or phrase for a word or words that sound identical, or nearly so, at least in the dialect the speaker uses.