Can My Guinea Pig Eat Sprouts?

Yes ty can and also if this is any help here are a few more things n their menu;
Pears, Oranges, Apples, Plums, Peach, Tomato, Broccli, Cucumber, Mint and peppermint leaves, Pineapple, Water cress, Basil, Clover, Dandelion leaves and flowers (as long as not treated with pestasides), Raspberries, Bueberries, and obviously Carrotts. To get a better view on the diet then go on net on metropolitan guinea pig rescue and look at the diet it really helped me. I hope this helps

Yes..they love all types of vegetation