From the Super Mario Wiki
Chained Kongs are a species of Kongs that appear in Super Mario RPG: Legend of the Seven Stars. Chained Kongs are located in Barrel Volcano. They usually appear alongside Vomers in battle. As the name states, Chained Kongs are apes that have shackles around the arms and legs for unknown reasons. They look very similar to Donkey Kong, only with chains and
without the necktie. In battle, they are weak against ice attacks and strong against fire. They have no special attacks, but have high HP along with high attack.
An action course in one of the doors in Bowser's Keep involves Mario avoiding the barrels thrown by them, referencing Donkey Kong.
Names in other languages