Frogs go woof

This morning Lewis was looking at himself in the mirror and I said to him "Who's that?" and he said "Lewis". Then I said "What is on your pyjamas?" and he wasn't sure so I said "That's a frog". Then I said "What noise do frogs make?" and he said "Woof". I said "No, frogs go ribbett" and he said VERY definitely and knowingly .... "Noooo, woof"!!!! This child is way too cheeky.