Alligator, Crocodile
A fish with two mouths has the number two on it because it's in prison (that's its prison number). Who put the poor two-mouthed fish in prison? An alligator. Because alligators hate two-mouthed fish.
How the alligator wishes it had a second mouth like the fish with two mouths, prisoner number 2! It believes that with another mouth, it would be the most talked-about predator, so it imprisons the two-mouthed fish out of jealousy.
None
わに
None
The reading is the same as the わに in "WaniKani." Ever heard of it?
So long as you've ever used WaniKani, you probably know the reading of the word alligator.