I have 300 pages, and I need to rename them—what should I do?

I run a website that sells stuffed animals, but since English isn’t my first language, I named all my products “Plush Toys” instead of “Stuffed Animals.” For example, I have a product called “Lion Plush Toy.” I’ve realized that “Stuffed Animal” is more popular in the US.

I have over 300 products—should I rename them all to “Lion Stuffed Animal” and similar names? How might this change affect my ranking? Is it okay to rename them all at once, or should I do it gradually, like 10 products per day?