Can I create file folders in iPad email

File folders? No. If you have an IMAP based email account, you can create additional mailbox folders and use those for sorting mail messages (if you are using a POP account, no).

Only if you are using an email provider that uses IMAP.

There are mail apps that you can use for that though

AltaMail

https://itunes.apple.com/app/id328890658?mt=8&ls=1