short plan

Should you have a WiFi+Cellular model iPad, you can either obtain a physical DataSIM from a Cellular Carrier of your choice, or for recent models of iPad with an eSIM you can enable Cellular directly from iPad settings:

Set up cellular data service on your Wi-Fi + Cellular model iPad - Apple Support

While prepaid plans are commonly available for iPhone, prepaid data plans are perhaps less commonly available from primary carriers. However, there are eSIM plans from MVNO network operators that offer short-term or prepaid data plans for iPad - these being aimed at occasional use and users that require short-term Cellular data when travelling (e.g., GigSky, ReadteaGO and Truphone).

For recent iPad Cellular models with eSIM, these plans can be activated directly from iPad settings; for older models, you'll need to obtain and activate a physical DataSIM from your chosen Cellular Carrier.

Contact your preferred cellular service provider for cellular plans for iPads. Whether the offer a short term plan or not is up to them.