Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft summon chicken command
Using the summon command to spawn in a minecraft chicken is simple, take the command and enter into chat and presto you have a chicken. Chickens are fairly simple creatures with not many data tags.
Summon a baby zombie riding a chicken (IsChickenJockey usage)
Baby zombies have an additional 5% chance of spawning as a chicken jockey in Java. But here is the summon chicken jocky command if you want to make it happen. Note that the chicken has the nbt tag IsChickenJockey which allows despawn as per usual hostile mobs.
/summon minecraft:chicken ~ ~ ~ {IsChickenJockey:1,Passengers:[{id:zombie,IsBaby:1}]}Chicken egg butt cool down
This is usually random between 6000-12000, but if you're up to something a little weird then you can set the EggLayTime tag. This is the amount of ticks until the chicken is ready to lay again.
/summon minecraft:chicken ~ ~ ~ {EggLayTime:6000} Lays an egg in 5 minutesHow to summon a baby chicken (chick)
Like most passive mobs in Minecraft, you can summon a chick by setting the Age tag to a negative number (under the "Additional" tab).
/summon minecraft:chicken ~ ~ ~ {Age:-1200} (Grows up in 60 seconds)/summon minecraft:chicken ~ ~ ~ {Age:-6000} (Grows up in 5 minutes)
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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.