So I learned it in 2010ish from my elementary school as:

Croc-a-dilly oom bop, bop bop bop
Dance to the chiga, chiga chiga rock
Fallo, fallo, fallo fallo fallo, FA-LLO
Hop-scotch chiga mush

We didn't really say trigger or chigger in the song it ended with the uh sound, the fallo sounded a bit like fuh-low so not wuite fellow or follow, the mush was more of a moosh, and we said bop bop bop instead of croc croc croc, most likely because after years of being passed down, the exact annunciation got a bid muddled by children's mispronunciations.