You've got the right cards to make it work. Splata could be nice, of course, but there's NOTHING wrong with Hindelga. In fact I would say that Hindelga is better. Everybody loves SoA but Hindelga's ability helps her win rounds more than Splata's and Freaks is nothing without winning an early round.
What Famous Falco said is pretty true but of the 4 clans he listed I'd use Sakrohm if I were you. When you win the first round with a freaks card most every opponent will 0 pill round 2 because there isn't much benefit to inflicting more damage early when the poison only goes to 3. So it's nice to force the opponent to use more pills than you while you wait to win again in round 3 or 4.
Liona shazam hindelga bertha murray jautya oxo anakrohm maybe?
I would have liona and shazam in every freaks deck right now. You can fill in others like hindelga quasichoco bertha etc to make the star count work. Check out the public presets for more deck ideas
This is just kinda off the top of my head but the standard Sakrohm half is going to be Petra, Murray, Aleister, and someone else of your choice. Dustyn Oxo or Wakai are good if you want to save stars for your Freaks half. That puts you at... what, 11 stars. 14 star Freaks... I'd go Hindelga, Shazam, Olga Noel and for another DR either Quasichoco or Wolfgang. Okay lets say Wolfgang because that puts you at 25 stars.
You can mess with that, change a thing or two, but that's pretty much what you're gonna need.
I tend to lean the other way with Freaks, playing them as the low-star half. This is because they have very strong life-gap potential in their 2* early in the game, and even if you don't inflict poison you've got heavy hitters left in the other half. Playing them as the as the high star half you're more reliant on hitting poison because if you don't you're left with Aleister and Oxo (from your example) trying to out gap your opponent.
Of course it works both ways but obviously leans towards a different style of play. Generally speaking I go with a 4322 Freaks and 14* on the other side.
Freaks imo are the funniest clan to play and have been my favourite since I joined. When I run Freaks, I tend to run low star halves like JO3SHMO said because all they're in my deck for is to get that poison in. I like going for either 4,3,2,2 or 5,3,2,2 as Hindela is a beast of a card and hard to look past imo. Shazam and Bertha are fairly staple for me whenever I make a half and for my 3* choice, it's either Quisachio or Akendram (still experimenting with Bikini Joe Ld). It's not worth using Liona over Akendram imo, save a star. It's only 4 attack manip and 1 damage.
As for which clan to play them with, go with PC or Sakrohm. PC have everything you need to compliment a Freaks half. Diana, Nabrissa, Mina, Lucy heck, even Leela wouldn't be bad. Sakrohm only have cards like Jautya and Aliester but it comes down to preference I guess.