I literally forget where these are every time I start a new game I thought it'd be easier to just make it into a video for you to enjoy.
1. Behind the axeman in Isle 1 (after you beat Cagney)
2. Behind the green house after you beat Beppi the Clown in Isle 1
3. The juggler after parrying 4 times in a row in Isle 2
4. The young girl after walking through the secret mountain path in Isle 2
5. Behind this stall in Isle 3 after beating Captain Brineybeard
6. Behind the dice in Inkwell Hell
Music is Funfair Fever. Enjoy!