The stomach and first part of the small intestine (duodenum) is connected by pylorus which has 2 parts. The on the stomach opening is called pyloric antrum and the opening in the duodenum is the pyloric canal type.
Not actually a valve, but sometimes referred to as the cardiac.
In a human, it's the pylorus, pyloric valve or pyloric sphincter valve. Not sure about frogs.
Pyloric sphincter.
~Pharmacist
Pyloric
epiglottis
The name of the sphincter between the esophagus and the stomach is called the LES, or lower esophageal sphincter.
Esophagus
A band of muscles at the opening of the stomach called the Cardiac (due to its proximity to the heart) Sphincter.
LES - Lower Esophageal Sphincter
• Esophagus Passes food from the mouth to the stomach
esophagus
Esophagus.
The Pylorus (the valve between the stomach and duodenum is the pyloric valve)
Osophagus
Pyloric Sphincter
stomach contents (food or liquid) leak backwards from the stomach into the esophagus