Here I am going to show you how to do three different types of nametag tricks with animals
This works for any type of Minecraft, but I am using PE in this one

1. Name: Grumm* or Dinnerbone*
Animal(s): any
Effect: Turns the animal upside down

2. Name: jeb_
Animal(s): Sheep
Effect: Rainbow sheep

3. Name: Toast*
Animals(s): Rabbits
Effect: secret skin unlocked with this name

*Case sensitive

Materials for these

• Nametags
• Anvil
• Animals
• Suggested: fences to contain the animals

Step 1: Grumm/Dinnerbone

So firstly grabs materials, then name a nametag "Grumm" or "Dinnerbone", then put on any animal (I used a horse) by (PC: Right Click) (Xbox: LT) (PE: Button that says 'Name')
Tada! Upside down!

Step 2: Jeb_

So firstly grabs materials, then name a nametag "jeb_", then put on a sheep by (PC: Right Click) (Xbox: LT) (PE: Button that says 'Name').
Tada! Rainbow sheep!

Step 3: Toast

So firstly grabs materials, then name a nametag "Toast", then put on a by (PC: Right Click) (Xbox: LT) (PE: Button that says 'Name')
Tada! Secret bunny skin!