uhhhh sponges??

Guardian temple:

idk i dont play minecraft

Dry sponge. They can only spawn wet.

sign

target

Warden redstone room:

F**K

Trick question... Ender chests

End cities:

oh you're right

However the Zombie head doesn't spawn naturally

Diamond block

silk?

Diamond blorck

Alsonig is

*string

Jungle temples

Diamond block, skull (if placed) , or the redstone Comparator. Not very sure about the piston.