Yes, guinea pigs can eat fruits and vegetables. It's important to provide a variety of fresh fruits and vegetables to ensure they receive proper nutrition. Some safe options include bell peppers, carrots, cucumbers, strawberries, and apples (without seeds). Avoid feeding them foods high in sugar or that are toxic to them, such as onions, garlic, and rhubarb. Always wash the fruits and vegetables thoroughly and remove any seeds or pits before feeding them to your guinea pig.