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. Notably, several drop from the ceiling in the room directly underneath Vitreous's room in Misery Mire, suggesting its slime is forming them there.

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. Additionally, strong weapons can defeat The Legend of Zelda-style Zols in one hit. In Link's Awakening DX, the The Legend of Zelda-style ones are red and the A Link to the Past-style ones are green. Slime Eye is a giant Zol boss who drops several A Link to the Past-style ones immediately before his fight.

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

The Legend of Zelda: Four Swords
They appear in red and have a squat pear shape. They once again split into two Gels when hit. A boss called Dera Zol also appears.

The Legend of Zelda: Four Swords Adventures
They appear in blue and green, with the blue ones appearing from under lifted rocks and green ones growing from the ground and able to sink back under. Neither split into Gels. Blue ones also replace enemies who are caught within the Quake Medallion's shockwave.

Link: The Faces of Evil
Zols appear as a squat, purple enemy with angry eyes. They attack simply by moving slowly to the side. Due to how short they are, attacking them with the sword can be difficult. Bots act similar, but are even smaller.

Zelda's Adventure
Zols are red and appear in the Shrine of Water. They have a fairly large amount of health and do not split upon defeat.

Cadence of Hyrule: Crypt of the NecroDancer featuring The Legend of Zelda
In Cadence of Hyrule: Crypt of the NecroDancer featuring The Legend of Zelda, Zols of various colors appear as somewhat common enemies. They move a space on every other beat. When defeated, they split into two Gels.