Leaving frozen veggie burgers out at room temperature for 2 hours could potentially lead to bacterial growth and foodborne illness. The general rule for perishable food items is the "2-hour rule." Perishable foods, including frozen items, should not be left at room temperature for more than 2 hours.
During this time, harmful bacteria can multiply rapidly, increasing the risk of food poisoning. If the temperature of the environment is particularly warm, such as during summer months, the risk is even higher.
In this situation, I would advise against consuming the veggie burgers. It's better to prioritize food safety and avoid the risk of foodborne illness. Discard the veggie burgers to prevent any potential health issues and remember to always follow proper food handling and storage guidelines to ensure your safety. When in doubt, it's best to err on the side of caution.