Alligaticon

The Alligatorcon was a Reptilicon mechanoid resembling an alligator built from parts of Optimus Prime by the Constructicons after he had been captured by the Decepticons and dismantled by Hook . City of Steel

It was purportedly big and heavy.

I'd say a little of both.

From Teletraan I: The Transformers Wiki, a Wikia wiki.