yes, they can eat many types of fruits and vegetables, from carrots to radishes to pomegranates etc. Just make to feed in moderation. Also, its important to remember that the main diet of guinea pigs is hay and vegetables. Fruits contain a lot of vitamins and minerals but they also contain lots of sugars, hence, moderation is important. I suggest limited quantity maybe once or twice a week. You can read well written article on "can guinea pigs eat pomegranate" here.