Speaking of these giant kids, I wonder where those other "giant" kids ended up at.
Ahhhhh... this is a question I have pondered and I think the answer is pretty grim.
The people in charge of the Biscuit Room Kids was who? Vegapunk. Well, Vegapunk isn't part of the World Government, anymore, you might say.
But, unfortunately, Vegapunk York is very much so Garling's hungry, hungry Slave Scientist:
And, before, Vegapunk was working under the WG, but was in charge of the kids, and Saturn was the one who had control over him. Saturn had little interest in Caesar Clown's failed experiments, not the lives of children hurt by them. So, he was fine letting Vegapunk do what he wanted there, especially since it was good Marine PR, most likely, "Oh, the WG is letting us save these kids using the top scientist in the world!" Would be dumb for Saturn to step in over this, especially when researching the kids could possibly lead to some other breakthrough regarding gigantification.
Garling? The new Boss controlling York? He's 100% the kind of person to restart the experiments using these kids.
I think they have probably been taken in as slaves by Garling, to be experimented upon by York, and this is going to be another straw that breaks the camel's back and makes Tashigi and others rebel against the WG.
Oda needs to do more to build up Garling as a villain for the Straw Hats, and this is totally something Garling would do, especially since he likely despises Giants after the Harald debacle in Elback, knowing how racist he is.
Saturn was a dick when necessary to stop rebellions, and generally was one of the Gorosei who tried to talk Imu out of murderous actions and also tried to keep situations from escalating in general, Garling seems to just be a miserable wretch after Shanks left and became a fucking Yonkou. I think Garling is going to push Science into really gross areas now that he has the power he does.