The short answer is yes! Kale is a trendy, healthy food in the human world and its just as good for guinea pigs in moderation. That being said, its important to read on and learn about the benefits of this leafy superfood and how to include it into your piggies diet.
Feed your guinea pig about a cup of fresh vegetables daily.[1] X Research source The key is to provide it with a lot of variety so that it gets a balanced diet. Veggies that are good for guinea pigs include celery, off-the-vine tomatoes, cucumber, corn (and corn husks), and bell pepper.
Guinea pigs can eat kale but only in moderation due to high amounts of calcium. Kale provides many health benefits for guinea pigs because its rich in vitamin C, vitamin A, fibers and antioxidants but also at the same time low in calories and fat.

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Nutritional Value of Kale for Guinea Pigs. Kale is one of the most nutrient-dense greens on the planet. It is rich in nearly every vitamin and mineral that humans and guinea pigs need for healthy growth and maintenance. Ill list the nutritional data on kale per 100 grams in the table below
A healthy diet for guinea pigs Find out more about the dietary needs of...

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Yes, guinea pigs can eat kale as it has high calcium and potassium, which can result in bladder stones and excessive thirst in guinea pigs if given in excessive amounts.