Custom Iron Golema

So I'm trying to build in my server iron golems that spawn with different textures in different biomes, trying to capture the golems from the different Minecraft games. I'm using a popular iron golem resource pack, that changes their appearance upon name tagging them, some even create giant piglen brutes (which I would appropriately make spawn in piglen areas and make team piglen). I'm wondering how I could do this, I need to make them spawn with the name tags (but without showing the tag) and then in the right biome specific areas, but my biggest concern is the lag that it could cause because it's a name tag? Is there anyway way to classify the iron golems without actually name tagging it? That way it can identify to match it with the texture pack?