Window Manager Switcher
Window Manager Switcher is a tool to switch the current Windowmanagers Window Manager.
Slacko
Slacko comes with JWM only - app is useful if more window managers are added. Available via-
PuppyMenu > Desktop > WM Switcher switch between Window Managers
Lucid Puppy 5.2x
In Puppy526 Lucid WMSwitcher lets you to choose JWM as window manager instead of the default OpenBox.