plink

So the gnarble swam around inside, trying very hard to think, And while he did, his floppy tail was tickling the plink.

The gnarble almost made it to the surface of the sea, But the plink chomped down and swallowed him as if he were a pea.

But his mouth was open long enough for the gnarble to swim free, He swam so fast the hungry plink did not have time to see.

Hardly had the word "brigands" crept into my mind with an accompaniment of heart-beats something like the plink!