Hi @jcox1 - Basically, the answer is no...at least for now. About all you can do is, as you said, allow multiple attempts or (in the case of a quiz that allows only one attempt) to give an individual student another attempt, as covered here: Once I publish a quiz, how can I give my students extra attempts?
There is, however, a Feature Idea that is still open for voting that is currently on the Product Radar. It does not hurt to register your vote here: https://community.canvaslms.com/ideas/1479-delete-quiz-attempts , since there is still no firm date/timeframe indicated for this, though as you may be aware, the Canvas engineers are quite busy with Priority: Quizzes.Next .
I hope this helps, Jo!