How to reduce draw calls of simple rotating objects

I have rotating objects in my game (used for item drops, coins, etc) and each of them only take 2 draw calls each but there can be 50-100 of these drops on the map before a player loots them.



As you can see from the screenshot it's just a simple model.

How can I optimize these? For the rest of the map, the static objects are batched and that helped the performance a lot, but these are dynamically created when enemies are killed. They get culled if they aren't looted quickly but a player can still create like 50-100 if they kill enemies quickly.

It's for a mobile game so 50-100 * 2 == 100-200 extra draw calls when they are on the screen

They are 3d and rotate but don't move position

 

You can use DrawInstanced for things like this. That'll reduce it to 1 draw call for each unique drop type.