Well, my favorite right now is the Wildwood Tofu-Veggie Burger Original Flavor which we buy at Trader Joe's. These are refrigerated, not frozen, sold in packs of 2

There are several other types I do not like nearly as much, such as
Dr Praeger's Gluten Free burgers, which we also see at Trader Joe's. These do not have a texture much like a real burger, they will fall apart if your next door neighbor sneezes. Some of their burgers do contain oats, and I do eat oats because I do not react to them.
Many people with celiac disease do react to oats and must avoid them.