Hi. Unfortunately, it isn’t possible to tell what grape variety (cultivar) that might be at this stage. If it were bearing fruit, it might be possible, but in general, identifying particular fruit cultivars is challenging if not impossible. Oregon State University has an excellent guide to growing table grapes here. Appendix A lists 13 cultivars of green table grapes grown in Oregon, so it could very well be one of those. When it eventually bears fruit, you might be able to make an educated guess based on the characteristics and photos that are provided. You will see that they vary in when they bear fruit, the size of the grape, the form of the cluster, and other characteristics. However, you could also have a cultivar that is not on that list. As for growing them in a bucket, that isn’t recommended, at least not for several years. Grapes are very large woody vines that are usually planted in the ground and trained for optimal fruit production and to prevent disease. If your cuttings are still developing roots, it might be OK to grow them in a bucket for the first year (I would do one per bucket), but they would need to be planted after that or moved to a much larger container, as they will grow very quickly. This article from Michigan State U. discusses growing grapes in containers and recommends using one that is at least 15-25 gallons. They also mention that using a dwarf cultivar is optimal, since that requires much less pruning than a standard vine. Good luck and sorry I can’t be more helpful with the identification!