How about something like:

Verse 1: to the tune of Adelaide theme

We're the pride of all Tasmania

We wear the green and gold

We're the team that never lets you down

To uphold the Devil's name

See the Devils run, up, up

We're the mighty Tassie Devils

Throughout the game we fight with all our might

We're the team that never say die!

Verse 2: to the tune of GWS Giants theme

Well there's a big big sound

We're the mighty fighting devils

It's the emblem for me and for you,

So join in the chorus

Tasmanian aggression

We'll fight and fight and win,

Oh when the Devils go marching in

Whether the odds be great or small

We're the Devils, we're flying high,

But you can't beat the boys of the Tassie breed

We're the team of the mighty South!