The dutch version I mentioned in the first post is actually in Swedish.

I believe our song is in the book _Sångbok för Scouter_ [Songbook for Scouts] published in Stockholm in 1937. First line only:

Kinkan kinkan kolli kolli vassa kinkan ka

Compare that with the Swedish version of the song post by "soderbo" :

Kinkan kolli kolli kolli kolli vassian kinkan koh vassian goh
Kinkan kolli kolli kolli kolli vassian kinkan koh vassian goh
Ila ilasiava ilasiava palamba
Ila ilasiava ilasiava palamba
Tjolafalla, tjolafalla Kinkan ... and so on

"soderbo" traces this song to a 1905 Swedish book and believes that it is German / Latin in origin.