My parents have lived in France for the last 15 years.
I did have to work on my expression a little, there, when I heard a particular French politician being described by his nickname: "Le grenouille"
Then there's the one about the travelling library where, near the farm, hens keep coming in and demanding: "Book! Book! Book! Book! Book! Book! ..." So eventually the library assistant lets them takes some but, curious, follows them to see why they were so insistent...
Oh sorry, the request was for good Frog jokes, wasn't it?