Grounded Frame Input
After SpongeBob takes damage there is one frame between when his damage animation ends and his falling animation begins where SpongeBob is considered grounded. On this one frame, SpongeBob can perform any action that he could normally perform on the ground.
One Frame Triple Jumps
By jumping on a grounded frame, SpongeBob can perform a double jump in mid-air. In combination with a Damage Boost, this achieves a triple jump.
One Frame Bashes
By bashing on a grounded frame, SpongeBob retains his damage momentum as well as gains vertical height.
One Frame Bowl
Spongebob can input a bowl on a grounded frame. However, this particular trick isn't considered useful for speedruns.