Imagine unironically trying to argue that the Biscuit Soldiers can block this:
This is what Katakuri will suffer if he tries to get frisky in CQC with King:
King plays ping pong with Smoothie:
Or just bombards her with his Wind Scythes while flying around her:
Smoothie has no chance of stopping them, given that even Zoro couldn't.
If Smoothie tries to gigantify, she just becomes a massive target and would have to deal with
So no, Smoothie and Cracker cannot carry themselves against King.