This is true regarding the food passed from stomach to the first part of the intestine in Rana tigrina

In Rana tigrina (frog), the food passed from stomach to the first part of the intestine is partially digested called chyme. In stomach, the food mixes with gastric juice by the gastric muscular contractions and causes the formation of chyme. In chyme, the partially digested proteins are present by the action of pepsin.