The phrase "oval ones" refers to objects or things that are shaped like an oval, which is a slightly rounded or elongated shape like an egg or a football. Full definition
Oil a large baking dish (I use an 8 × 12 - inch oval one) and spread in the tortilla mixture and any sauce hanging out on the bottom of the bowl. (bojongourmet.com)
The silver oval one is one that my mom gave to her. (theartyologist.com)
The little oval ones that you wear over your shoulder would be cute for the little guy. (theletteredcottage.net)