John 6:57

Strongs Greek #649, τρώγω; to gnaw, crunch, chew raw vegetables or fruits (as nuts, almonds, etc.): ἄγρωστιν, of mules, Homer, Odyssey 6, 90, and often in other writers of animals feeding; also of men from Herodotus down.

The chewing behavior of animals like sheep, where they regurgitate and rechew their food for further digestion, is called "rumination." Animals that exhibit this behavior, including sheep, are known as "ruminants." The process involves a series of digestive steps, including swallowing food into one of the stomach compartments, partially digesting it, regurgitating it back into the mouth, and then rechewing it thoroughly before swallowing it again for final digestion.

Another word for "ruminant" is "cud-chewing animal." This term directly refers to the characteristic behavior of these animals, where they chew a semi-digested mass of food, known as "cud," after regurgitating it from their stomachs. This word is used of the animals mentioned in Leviticus 14/ Deuteronomy 14.