Answer:
I have a tongue, but cannot speak. I have a bed but cannot sleep. I have four legs but cannot walk. Yet I move as you do. What am I?
I shrink smaller every time I take a bath.
Teenage girls are pros at creating me. Learn me in classes.
It's in your hand though you can not feel it. Only you and time can reveal it.
I have memories but none of my own whatever's on my inside is what is shown. If I'm ever different it's because you changed me I feel like a decoration here for you to arrange me.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.