Is there a command to clone entities?

In the snapshots of 1.10 you can clone entities with the structure block

If you're trying this with people, it's impossible to do unless you're on a certain mod, such as the clone mod, and what you do on that mod is you kill yourself or the person you want to clone and it somehow clones itself as what I've heard of.

1. If you're doing this with mobs, it's possible unlike people. What you need to do is type in the chat or command block you're using is /summon. It should list animals/mobs in the chat, but in the command block it won't.
2. Type in the animal/mob you want such as "spider" or "villager".
3. You can also give your mob a nametag. If you do want to, you'll have to type its name obviously. Here are some interesting names:
   • Toast. What it does is makes it a different type, unlike the normal ones. It makes it black and white (not the normal black and white one.)
   • Do you wish to ride a horse upside down? Well, look no further. All you have to do is type in "Dinnerbone." It makes any mob or animal upside down, and voila, you can officially ride a horse upside down.
   • Do you wish to have a rainbow sheep? Well, just type the name, "jebb_" in. What it does is makes your sheep turn rainbow.
   • You know how vindicators only kill you or your friends? Well, you can make it kill anything. Just name it Johnny and it will kill anything instead of it just targeting you and your friends.

If this one doesn't work, well I'm sorry. I've only heard of it. That's all the advice I can give you. Have a great day!

There is a way to copy entities in minecraft using the structure block and when u want to load that specific block and entitie u can use a jigsaw block