Hoglins and Zoglins aren't part of the "monster" family, meaning that iron golems and snow golems won't automatically attack them.
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We're actually already tracking this issue at MCPE-73838, so I will resolve and link this ticket as a duplicate.
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Confirmed by reading the entity json files in the vanilla 1.16 behavior pack. I think it is probably intended for Hoglins to be animals and not monsters, but I'm not sure about Zoglins. Since Zoglins attack villagers on sight, it would make sense for Iron Golems to attack Zoglins on sight. Although, you could say that Iron Golems wouldn't know what Zoglins are, so they wouldn't know they are dangerous until they attack.