According to the Minecraft game wiki: “Each baby zombie, baby husk, baby zombie villager, baby zombified piglin, or baby drowned that spawns has a 5% chance to check for an existing chicken ...

It's unclear if this is to scale, or if this is meant to represent a baby zombie on a regular size ... his pal Henry, and a giant zombie pigman alongside the fighting ring, a chest with gold ...

When the Nether Update is released later this year the zombie pigman will be no more. Instead, it is being renamed to the zombified piglin, to bring it in-line with the new mob, the piglins ...