I have a CD performed by "various artist" entitled "New Orleans Party Classics" {1992 Rhino Records} that has an Iko Iko version that is very similar to the lyrics Bob Coltman lyrics posted. Unfortunately, I can't find the CD package to identify who sung this {or other songs} on the CD.

The singer's enunciation isn't clear {to me}. But here's my take of the verses:

Chorus:
Iko Iko
Iko Iko ah day
Jockomo feeno ah na nay
Jockomo feena nay

Hey now (hey now)
Hey now (hey now)
Iko iko ah day
Jockomo feeno ah na nay
Jockomo feena nay

My spy boy and your spy boy
sittin on the bayo
My spy boy told your spy boy
I'm gonna set your tail on fiyo

My ma reine and your ma reine
sittin on the bayo
My ma reine told your ma reine
I'm gonna set your thing on fiyo

We gone down to Bollashon [?]
We don't care till the whole don [damn?] mornin
See mah ree [??] down the railroad track
Put his head in ah chicken sack

My little boy told your little boy
put your head on miyo
My little girl told your little boy
we gonna get your chicken wiyo

We gone down to Becca town
We don't care if you mess around [?]
Call us what you tell them to [?]
Cause we don't aint do what you tell us to

-snip-

It should be noted that the performer sings the line "Iko Iko ah day" or "Jockomo feeno ah na nay/Jockomo feena nay" sometimes after each line, and sometimes after two lines.