I think I may have mentioned this in the past, but cannot find it in my profile, so here goes: If you're looking to place multiple iso's on a flash drive and boot from them, checkout: https://www.ventoy.net/en/index.html. This screenshot shows only a few that I have on my 32GB flash. Using "drag and drop" you can place almost ANY iso, in Ventoy and boot
from it. There is even an option for "persistence".
Clarity has provided some very good info and guide, on exactly how to use Puppy Linux, with Ventoy.
viewtopic.php?p=38449#p38449
This is the best way for using Ventoy with Puppy Linux.