The ones I know of are The Beatles’ I Am The Walrus - “elementary penguin singing Hare Krishna” (a reference to Allen Ginsberg apparently), George Harrison’s My Sweet Lord, Lennon’s Give Peace A Chance and Stevie Wonder’s Pastime Paradise.
I can’t recall for sure if any of their lyrics mention Hare Krishna, but John ‘Bloodclot’ Joseph and Harley Flanagan from the hardcore band Cro-Mags were Krishnas. Wouldn’t surprise me if they mentioned Hare Krishna.
Old straightedge band Shelter were all Hare Krishna’s. Let me dig my albums out and see if they mention it specifically in a song. I know they talk about their religion a lot, like in “In Defense of Reality”. They’re still at it, and their new guitarist is…yummy. Can I say that?