Mud blocks can be found naturally in small patches in swamps and jungles. Walking on mud will slow you down just like soulsand would. If you mine a mud block it will drop 4 mud. Mud should have the same texture as clay but dark brown. Using mud you can craft mud blocks by placing four mud in a 4x4 square. You can also craft mud blocks by placing 8 dirt around a water bucket and it will consume the water but not the bucket. Putting mud in a furnace will give you mud bricks which you can use to craft mud brick blocks which look like nether brick blocks but are dark brown. Placing mud blocks in a furnace will give you a dried mud block(google dry mud too see what it would look like). Thank you for reading and sorry for bad english!