No.
However, Canvas includes a feature for students that allows them to test “What-If” scenarios on their course grades. They can test different scores for upcoming or previously submitted assignments, to calculate what kinds of scores they’d need to earn for the semester grade they want to reach. Some students have erroneously believed they were changing their actual course grades, but this is not possible.
In the top-right corner of the Grades tool, students who have entered What-If scores can revert to their actual, instructor-assigned scores: