This is a chest in large size. You can build a secret storage in it or use it as a dwelling.
This is still available as a sheep, it's also in the description.
Build the chest house simply from the pictures!
Here's another outside picture:
An inside picture:
You can also build the Chest House bigger and have it
...and set it up nicely.
Here's another option as a sheep:
Here's a picture from the inside:
You can enter the sheep through one of the four legs: