Delightful collective noun this, suggesting a harmless creature soaking up the sun on a warm mud bank. Just don’t tread on one when it’s basking. Or ever.  And remember:
Row, row, row the boat, gently down the stream,
Merrily, merrily, merrily-oh, life is but a dream.
Row, row, row the boat, gently down the stream,
If you see a crocodile, don’t forget to screammmmmmmm!!
