They are typical nonsense lyrics for this type of tune. Here is how I hear them:

ROCKY ISLAND

Went up on the mountain
Sow a little cane
See my candy darlin'
Pretty little Liza Jane

Goin' to Rocky Island
Ho, honey, ho
See my candy darlin'
You know I love her so

Wish I had a big, fat horse
Corn to feed him on
Pretty little girl to stay at home
(And) feed him when I'm gone

Goin' to Rocky Island
Ho, honey, ho
See my candy darlin'
You know I love her so

Dark clouds are risin'
Sure a sign of rain
Put your old grey bonnet on
Sweet little Liza Jane

Goin' to Rocky Island
Ho, honey, ho
See my candy darlin'
You know I love her so

Source: transcription from Ralph Stanley 'A Man and His Music' Rebel 1530. Recorded 22 March 1973 at Clinton, Maryland.
PS.

Cheers, Stewie.