Zol

Zols are large slimes.

The Legend of Zelda
They move slowly around dungeon rooms. Attacking them causes them to split into two Gels. They usually appear in a matching palette to the dungeon walls, but in some dungeons it is black instead to blend in with dark rooms.

The Legend of Zelda: A Link to the Past
They again appear in different colors depending on location, and hop slowly after Link. They tend to drop from the ceiling or grow from the floor, and no longer split into Gels.

The Legend of Zelda: Link's Awakening
Both types from the previous game appear, albeit both hopping after Link. Their pear shape is replaced with more of an oval shape. Sometimes, the A Link to the Past-style ones additionally are found in trap chests. Ones that grow from the ground are always A Link to the Past-style. In Link's Awakening DX, the Legend of Zelda-style ones are red and the A Link to the Past-style ones are green. Slime Eyes is a boss comparable to a Zol, and in fact drops several A Link to the Past-style ones immediately before his fight.

The Legend of Zelda: Oracle of Seasons / Oracle of Ages
They appear as they do in Link's Awakening DX.

The Legend of Zelda: Phantom Hourglass
They appear and resemble their original American artwork. This is the only game they share with ChuChus.