Can lagoon be called lake?

No, Lagoons are different from lakes. Lagoons are calm and shallow water bodies surrounded by barriers. They are formed when a shallow water body is separated from a large water body by a small landmass, resulting in the formation of a relief feature that resembles a partially enclosed lake. Lakes refer to an area that is filled with water in a localized basin and typically surrounded by land. They are found mainly inland, and they do not form part of the oceans, distinguishing them from lagoons.

Further Reading:

• Erosional landforms
• Geomorphic Processes