What is the collective noun of juicy?

There isn't a specific collective noun for "juicy" because it describes a quality, not a group of things.

However, you could use a collective noun that implies juiciness, depending on the context:

* For fruits: a basket of juicy oranges, a bunch of juicy grapes

* For gossip: a torrent of juicy details, a flood of juicy rumors

* For a general sense of abundance: a wealth of juicy insights, a treasure trove of juicy information

Ultimately, the best collective noun to use will depend on what you are referring to.