I Want to delete photos from camera roll that I saved from a certain app called Ifunny (App is a funny picture sharing community) How do delete them completely from my iPod

To delete the pictures, go to your photos app and press albums. Press edit at the top right hand side press the circle with the minus button and then press delete. To delete the pictures from your camera roll, go on the camera roll album, press edit, press the photos to delete, and press the delete button at the bottom right hand corner.

No.

Restore your device and dont restore from backup.

Jesus Christ what a nightmare. Why can't Apple get something as simple as deleting all photo right? I just want to click 'select all' then delete. GEEZ.

Likely because users would accidently delete all photos and then get mad at Apple for allowing them to delete all.