Minecraft 1.20.5 has changed syntax on many commands, so most commands will no longer work without an update.
An update is in progress, you can check compatibility progress here.
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Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft summon zoglin command
Using the summon command to spawn in a minecraft zoglin is simple, take the command and enter into chat and presto you have a zoglin.
Summon a baby zoglin
Are they cute or a little tragic? There's a special tag for a baby zoglin, unlike passive mobs they never grow up.
/summon minecraft:zoglin ~ ~ ~ {IsBaby:1}Suggestions or found a bug
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If you're looking for a particular summon mob generator you can link to these specific versions of the command generator.