Let me know if this FAQ entry doesn't address your question: https://opengameart.org/content/faq#q-how-to-credit

Although OGA is built with video games in mind, you'll note it doesn't specify "you can use any of the art submitted to this site for video games." As in, you may use the art for anything you want as long as you comply with the license terms; Give credit, don't imply endorsement, see each license details in the FAQ for specifics. :)