Rhymes with at

Linnea calls BamBam Rat. Because of his tail. And she calls Twisp Fat, even though he isn't fat, just OMG BIG.

Auri was usually just Rat as well, because she's small.

Then dh came up with the perfect "at" for Auri.

Brat.

Which she is, big time. Love that cat.

So yeah. Rat, Fat, and Brat, aka BamBam, Twisp, and Auri.