A group of pineapples is commonly referred to as a "bunch" or "crown." However, there isn't a widely recognized term specifically for a group of pineapples like there is for other fruits. Generally, since pineapples grow individually on plants, they are typically seen singularly rather than in groups.
A group of Dolphins are called a Pod
A group of dolphins is called a pod. If that is your question.
A group of shrews is called N.O.W.
a group of Blackbirds is called a murder
A group of hens is called a brood.
A group of martens is called a richness
A group of grouses is called a covey
A group of grapes is called a bunch of grapes.
A group of Spiders is called a cluster or clutter. Spiders belong to the group of animals called arachnids.
A group of swine is called a sounder or drift
The -OH group is called the hydroxyl group
A group of skunks is called a surfeit or a stench.