The Jewel Triplets Gang is a gang consisting of three babies that appear in the episode "The Great Patty Caper." According to a cop that also appears in the episode, the gang is infamous. Two of the babies in the gang, which are male, are twins, while one of them, a female, looks completely different.
Closer to the beginning of the episode, SpongeBob and Patrick see them in the Oceanic Express's restaurant. However, two of them are standing on top of another and are in a disguise, which makes them look like an old lady. The other one is in a stroller. SpongeBob easily mistakes them for an old lady with her baby.
Later in the episode, while a cop is searching the baby's diaper for the key, he finds Neptune's Jewel of the Sea. He then reveals to SpongeBob that the babies are the Jewel Triplets Gang and arrests them.
The two males are green and the female is light purple. All three of them wear diapers and they all look as if they are much older.
If one looks at the legs of the "old lady" from the earlier scenes, they are purple. This is illogical, because only the female baby is purple.
The baby on the stroller can be distinguished from his twin brother by his freckles and yellow eyes (Notice the features on the picture).
The stroller itself is comprised of "the defiled corpses of our victims," according to one of the twins.