Often known as lamb’s lettuce, mâche, fetticus, feldsalat, nut lettuce, field salad, and rapunzel, corn salad is an edible leaf vegetable that has a nutty flavour and soft texture. It is popularly served as salad greens.
It is also often called doucette or raiponce, as an alternative to mâche in French cuisine.
So can guinea pigs eat corn salad and if they can how much of it can be eaten?

Lets take a look at its nutritional data and find out more.
Calories 21.0(87.9 kJ) 1%
From Carbohydrate 12.8(53.6 kJ)
From Fat 3.3(13.8 kJ)
From Protein 4.9(20.5 kJ)
Total Carbohydrate 3.6g 1%
Total Fat 0.4g 1%
Protein 2.0g 4%
Vitamin A 7092IU 142%
Vitamin C 38.2mg 64%
Thiamin 0.1mg 5%
Riboflavin 0.1mg 5%
Niacin 0.4mg 2%
Vitamin B 60.3mg 14%
Folate 14.0mcg 3%
Vitamin B 120.0mcg 0%
Pantothenic Acid 0.0mg 0%
Calcium 38.0mg 4%
Iron 2.2mg 12%
Magnesium 13.0mg 3%
Phosphorus 53.0mg 5%
Potassium 459mg 13%
Sodium 4.0mg 0%
Zinc 0.6mg 4%
Copper 0.1mg7%
Manganese 0.4mg18%
Selenium 0.9mcg1%
Cholesterol 0.0mg0%
Alcohol 0.0g
Water 92.8g
Ash 1.2g
Read More http://nutritiondata.self.com/facts/vegetables-and-vegetable-products/2426/2#ixzz2sjtRe73t
As you can see corn salad contains a hint of fat, it contains some acidic content, and a little calcium.
It also contains a very high amount of vitamin c which is fantastic for guinea pigs.
So guinea pigs can eat corn salad, 3-4 times a week should suffice due to the acidic content. But it’s a Fantastic food for guinea pigs to eat, so much vitamin c in it and not much bad stuff.