I'm working on a children's book about boats entitled 'Things That Float'.

Things that float,
Could be a boat,
But other things float too,
Like a dinghy, which grew,
From the air that you blew,
A kayak, or canoe,
But not a gnu,
Unless it was stood on a raft,
Or in a hovercraft.

Things that float,
Could be a boat,
But other things float too,
Like a ferry,
Or a barge,
Or an oil tanker (very large),
I often wonder,
How these don’t go under?

Things that float,
Could be a boat,
But other things float too,
Like a trawler,
Or a yacht,
Which rhymes with cot,
But whether blue or pink,
A cot would still sink.

Things that float,
Could be a boat,
But other things float too,
Like a skiff, or a lugger,
A ketch, or a cutter,
A sloop, or a launch,
Or a man with a paunch,
Who would float,
Even when not in a boat.

Things that float,
Could be a boat,
But other things float too,
Like a galleon, or a trireme,
A battleship, or submarine,
Which can descend to the deep,
With a periscope to peep,
At the boats,
And other things that float.