Is there any interesting 2018-2020 debuted girl group?

[spopo]

Fromis, whenever their company remembers that they're musicians. 

Besides that, I'll second Weeekly, because @me was a lot of fun. 

BVNDIT (Chungha sister group) has released a lot of great music and the girls are uber talented.  Their latest comeback was probably their weakest, but anything before that is killer.

If you're into techno check out GWSN--really different from what other groups are doing. 

Dreamnote has lost a couple members, but they do more power-cute, poppy fare that's a lot of fun. 

Nature has also lost a few members, but recently picked up Kim Sohee from IBI/P101, and their newest mv is delightfully horrific. 

Hot Place is technically a "rebranded" group, but TMI was a fab EDM bop.

Hinapia's debut was pretty okay, better if you miss Pristin enough.

Fanatics has some really great dancers.  Their music has been so-so so far, but the girls are certainly interesting even if their songs aren't.

Pinkfantasy is broke, but they do horror-poprock, and it's pretty good stuff.  Most of the girls are older, from failed nugu groups, so they're a little more experienced than other rookies.

Venus is fun, sort of a spiritual successor to Orange Caramel, in trot form.

3ye has had some stellar music too (check out OOMM), coming from such a small company.

That's just off the top of my head.  There are a lot of good rookie groups out there...  some are doing what everyone else is doing, but there's a lot of talent out there too.