How can I get wheat seeds? (Not by village farms) I used the hoe on grass blocks but seeds didn't drop.
Seeds have a chance to drop by breaking Grass (not Grass Block). If you really can’t collect grass after a few tries, try to reinstall minecraft or make sure you don’t have any mods interfering it.
Yes, Mods in pocket edition do exist; try to save your world by connecting your phone (if android) and move the world file.