This is a mod for Stardew Valley that allows you to purchase multiple animals at once. There is a dialogue that allows you to name each animal, and each one is a unique and distinct entity that will behave a little differently.

It works by using a special mod, which adds a purchase button on Marnie's store. You can choose to buy one or more items, and they will still be listed and priced individually.

When you buy more than one item, you will still be presented with a dialogue that allows you to name each item. You can even see what each one is and what it does.