Issue Description:

Hello! I was wanting to add the chicken spawn eggs to a villager for trade. But for the life of me can not find any of the correct spawn egg ids. I'll get the spawn egg saying chickens:spawn_egg but the egg itself is named null whenever I try to get one of the names working (I.E. water chicken) I was wondering if you explain the way you handle the spawn egg names. And if its possible to set them up for a trade.

In pre 1.12 it was handled by meta id, in post 1.12 its handled with nbt data.