Dinosaur common names?

[Halichoeres]

I dunno, a lot of those names seem to be a mouthful and way to long for common names.

Heh, they seem to be of a piece with some of the longer bird names, like Rwenzori double-collared sunbird.

[Concavenator]

Here are some ideas:

Non-halszkaraptorine/microraptorine/jnenlagiine dromaeosaurids: ground hawks (I think I've seen this elsewhere but I like it).
Halszkaraptorine dromaeosaurids: duck raptors.
Unenlagiine dromaeosaurids: heron raptors.
Microraptorine dromaeosaurids: four-winged raptors (I also think I've seen this before).
Therizinosaurs: feathery sloths.
Spinosaurids: river lords.
Apatosaurinae diplodocids: mighty whiptails.
Diplodocinae diplodocids: light whiptails.
Mosasaurs: snake dragons

[Papi-Anon]

Anomalocaris:
"Killer Shrimp"

Opabinia:
"Elephant Shimp"

Hallucigenia:
"Trippy Spike-Worm"

Pikia:
"False Fish"

Concavenator:
"Sailbacked Hatchetmouth"

Dilophosaurus:
"Double Fin-Head Hunter"

Monolophosaurus:
"Fin-Head Hunter"

Corythosaurus:
"Fin-Head Duckbill"

Multituberculates:
"False-Rodents"

I'm personally fond of the colloquialism "Fishapods" for basal tetrapodomorphs.