Where I can find: child mukade, thunder stone, lotus spoon, charcoal??

Child Mukade: found in Iwanaga Cavern, Cave of Three Deities, Chinji Cavern, Honomusubi Cavern, Yomotsuhirasaka, Nishidera, etc.
Thunder Stone: rare drop from essentially any monster, just be lucky
Lotus Spoon: rare drop from a Swamp Sticky
Charcoal: common drop from Akamekabe (from Mount Kurama)