Kaido said that when your mind and body can finally harness the potential of your ability, it's awakening
Based on that, I think Chopper has already awakened everytime he goes monster point, or to be precise, he forced himself to awaken his df with rumble balls, but since both his mind and body couldn't yet able to harness his ability, he went mad (pre TS and when Frankie's souls is inside him) and his lost his life force (both pre and post TS)
same case with Black Maria I guess, since she's able to breath fire and throw webs from her hands, which is really weird since spider throw webs from their ass and breath fire and we knew that she used drugs to alter her form like Chopper did, but I'm not really sure about her thou
Other than them, King, Queen and Sasaki I think also already awaken their DF with their "this is how this dinosaur hunt in their past" speech
Perhaps since they can do that weird shit after awakening their DF, they think that's how dinosaurs body works
I think both Sakazuki and Kuzan also awakened their devil fruit, which made Punk Hazard terrain change completely in their battle
Kaido, his new giant flaming dragon form which double his size and covered him in magma like substance, is also his form of awakening, I think
Other than those people, I'm not really sure, Marco, Borsalino, Sengoku, Teach?
Or Jack??
Needs to see more of them to assume things, I guess