Here is Apple’s advice for lost or stolen devices:
If your iPhone, iPad or iPod touch is lost or stolen – Apple Support
Use the Find My app to locate a lost or stolen device – Apple Support
If the Find My iPad feature was enabled prior to it being “misplaced”, then if active, you would stand a good chance of locating it.
However, if the feature was not activated prior to being misplaced - or the iPad has been inactive for more than 24 hours, the last known location will not be available - and all opportunity to use technical means to recover the iPad have been lost.
There are no third-party Apps to locate a lost device.
Consider that “Find My” works by having the device securely signed-in to Apple’s back-end server infrastructure - to which a device is (a) continuously updating its computed location over an active [WiFi or Cellular] network connection, and (b) it can retrieve instructions to display a message, make a sound, erase etc.
It is connection to Apple’s servers that facilitates finding and managing lost or stolen devices. Without such connection, finding a lost device by technical means is impossible.