User blog comment:Fliu/Chapter 929: Jurassic Wano/@comment-113.255.128.221-20181231153131/@comment-3507581-20190101150331

It was supposed to be an allosaurus, just look at the number of fingers; their number is not appropiate for a tyrannosaurus. Check the article "Indomitus Rex" in the One Piece Podcast for a better explanation.

And yes, this is what you expect from an hybrid Ancient Zoan Form.