Hah, looks like you're right!
I've tried again and done a bit better: Huckle Berry Publishing Co (with Huckle and Berry as separate words) was registered to a residential address in Tennessee.
https://www.info-clipper.com/en/com...kle-berry-publishing-co.usd7pcrp.html?retry=1
(It's not listed on Tennessee's official companies register though (which includes terminated companies), so far as I can tell.)
However, the address was last sold in 2001 (after Rags was published), so will be in different occupation now.
I've also found one reference to a Berry Huckle Publishing Company at the same address registered in 2008, but lack of supporting info suggests it's erroneous. (
https://www.whereisalocal.com/business-23792529-berry-huckle-publishing-co-elizabethton-publishers)
And for completeness, one reference to Huckleberry Publishing BV at the same address, but they seem to be a Dutch software company so again it seems like bad info.