Doudou likes the "3 little pigs", he thinks it is fun.
I would show him how to inhale and try to blow things by blowing in his face :) When he sees the wolf he shows his dislike of him but it does not seems to bother him on his sleep. Maybe he is too young for that?
Also, when the wolf knocks, I would knock on the wood to simulate the knocking sound.
Another favorite of Doudou is "Pinochio". When I tried to put Doudou to sleep, I would read him "Good night moon" which say good bye to everything in the room. That sounds like a spell because all the "Goo nights" makes him feel sleepy :)