Yes.
Giraffes are ruminants.
Ruminants chew their food twice: first, they swallow already chewed pieces, and then they bring them back from the front sections of the stomach to the mouth. This physiological process is necessary to extract the maximum amount of nutrients from the food.
However, like other animals, giraffes can experience true vomiting, for example, in cases of poisoning or inflammatory diseases of the digestive system.
