1
general::
Phrase(s): know no more about something than a frog knows about bedsheets
Rur. to have no knowledge of something. • Don’t let Bill fix your car. He knows no more about cars than a frog knows about bedsheets. • When I first started studying French literature, I knew no more about it than a frog knows about bedsheets.
McGrawhill's American Idioms And Phrasal Verbs