Jay-Z sounds like he's reading from the index of Monstropedia (yes, there is a Wikipedia-style site focused entirely on monstrous creatures).

In this technological age, it's easy to find background on all of Jay's monsters of choice. 

Sasquatch, a.k.a. Big Foot, is a great North-American legend that has existed since before European colonization, pictured as a woodsy, hairy giant. Godzilla and King Kong are movie-star monsters, both humongous and endowed with a propensity for crushing villages. The Loch Ness monster is an ancient Scottish legend who is water-bound (and actually kind of cute), and goblins are legendary English demon-creatures who tend to be tiny and appear in annoyingly large numbers. 

We shouldn't need to tell you that ghouls and zombies are the best kinds of messed-up former humans (check out Shmoop's "Thriller" for a history of zombies in the popular consciousness). The best interpretation we could find of Jay-Z's monsters, though, was a version brought to us by the cutest monsters around, the Muppets. "Piggy Minaj" is not to be missed.