That's Amore (or A Moray, in this case)

Ocean dwelling, pea green
If he seems a bit mean
That's a moray

With a mouth that won't close
Good for chomping his foes
That's a moray

Hiding in the reef, darting like a thief
Causing lots of grief as he sorts out his dinner

Seabaja.com Isla Tortuga photo Panamic green moray eels

Sharp serrated fangs out from overhangs
Curb his hunger pangs; he emerges a winner

Benthic fish with a wish
For raw crab on his dish
That's a moray

His fierce face from above
Only mothers could love
That's a moray

Check his vomerine teeth
He can hide in their sheath
That's a moray!

Kids' Songs

You'll have to check with me for the tunes on these; as far as I know they're not parodies of anything!

Giraffe

I'm a little giraffe, and I live in the zoo
I make friends with the staff; they look after me, too
When I'm five-and-a-half metres tall like my dad
I can reach my own leaves
Won't I be glad?!

Horse

The horse gets up rather early

She finds her favourite grass and hay

And when the dew shines soft and pearly

She knows it's going to be a great day!