They're mostly just trophies, to use as decoration, but can be incorporated into firework recipes to make an explosion in the shape of the monster's head.
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In creative mode you can spawn a zombie with the egg
Try out "Planet Minecraft" there's millions of skins available. All of which have different heads.
You cannot 'tame' a Zombie Pigman in Minecraft. However, if you go into the Nether, they will not naturally attack you. They will only attack you if you hit a Zombie Pigman first, then they will all swarm and attack you.
~0.7 of player speed
no