Proposed Canon
First Mentioned: IPTSF Text 5
Brontoswords are Mount Units used by Goodminton. A brontosword is described as "great lizardly monster", its size as "enormous" and its gait as "flumphing".
Goodminton's Chief Warlord Tommy Firebaugh used a brontosword as his mount, as did his second in command and successor as Chief Warlord, Pom Fritz.
Brontoswords take at least 2 turns to pop in a Level 4 City.
Brontoswords are Heavy Units.IPTSF Text 11
It may be possible to pop plated Brontoswords.
 Real World References
Its name seems to be a portmanteau of "brontosaurus" and "sword".
Its way of moving - described as "flumphing" - may refer to a monster from Dungeons and Dragons universe.