How do i make giant entities?

How do I make giant mobs in Minecraft? I know how to summon giants and giant withers but no other giant mobs. I would like to know how to summon giant ender dragons. Any nbt tags are appreciated, as well.

Solution 1:

There is no way to make giant mobs currently, except for Slimes and Magma Cubes.

The Giant, although it uses the same skin as a Zombie, is a different entity, and it's appearance isn't related to any NBT tags.

Same goes for the Wither, who doesn't use the same ID as Wither Skeletons.

For Slimes and Magma Cubes, you can set the Size tag to any value from 0 (smallest natural Slime) to 255.