You can cancel Tumble state at any point after the duration of hitstun with any move/jump.
Puff's Bair and Uair both autocancel if you land by frame 7, so if you mash up or back on the C stick you could potentially do what fox can with lasers.
Currently unsure if applicable in any meaningful cases (seeing as Puff isn't a FFer). Will consider. Potential for additional Andale rest setups.