Why does frog's mouth need to close tightly?

A frog's mouth needs to close tightly to help with various essential functions, including capturing and swallowing prey, preventing water loss, and protecting its respiratory system. By sealing its mouth, a frog can effectively hold onto its food while it swallows and can also manage its breathing, especially when submerged in water. Additionally, a tight closure helps prevent foreign particles from entering the mouth and throat, ensuring the frog's health.