What is the term for transposing letters of words when speaking?

Answer 1

Spoonerism is the unintentional exchange of letters or syllables between two words or even within a word. The word derives from a 19th Century Clergyman. Also Metathesis is the reversal of letters within a word.

Answer 2

A Spoonerism. It can involve single letters or syllables. My daughter went to say "carpet shampooer" and it cam out "Carpoo shampeter."

Answer 3

spoonerism