RE lyrics: I've chosen to use the lyrics as recorded by Bobby Helms in 1957 as it was the most popular recording and is the recording most commonly heard in movies, like Home Alone 2. In 1957, Helms sang "Mix and a-mingle in the jinglin' feet". When Brenda Lee recorded it she sang "Mix and mingle in the jinglin' beat".
RE chords: if you can't play the [G#dim7] chord, you can substitute [Gmaj7] although it doesn't sound quite as sweet. And in the last line of the first verse, the last [D7] should actually be a [D7+5]- 3223 - but I've chosen to leave it as [D7] so that the whole group can be in on that up-down pickup chord into the next verse.
"Jingle Bell Rock" is an American popular Christmas song first released by Bobby Helms in 1957. "Jingle Bell Rock" was composed by Joseph Carleton Beal (1900–1967) and James Ross Boothe (1917–1976).
*****REVISED November 14, 2019 - SR*****
A video for this song: