In the node of the magic net
Link could see that the figure in front of him was not actually a Yabba but was merely using a Yabba body.
In the game, this sort of body-changing ability often appeared on Mysterious-travel Magicians in the early part of the game. Meanwhile, in the later parts, it usually appeared on strong existences from the Void.
The person in front of him was most likely not some Mysterious-travel Magician. Most likely, he was from the Void, someone able to travel across dimensions. Anyway, it was without a doubt that he was strong, at least Legendary level.
There were many titles for such existences, such as Travel Magician, Dimension Traveler, Astral Mages, etc.
They were always very strong and very mysterious, choosing not to participate in worldly affairs and appearing as they pleased.