Grung and Bullywug

Grung and Bullywug
Some Grung were found imprisoned in Rayska. They attacked Jerry when he tried to free them but eventually they were freed.

Later different Grung were encountered attacking two Vulcuudian ships. The group included elite Grung, the Bullywug, and King Bully. They used machines called Apparatus of Kwalish Cracker-barrels to submerge and travel below the waves.

https://forgottenrealms.fandom.com/wiki/Grung