Not in-game, so the only option is to manually delete them from the save folder. Type in this path in a file explorer window to be taken there. The savefiles are named burgertale_savefile0 for the first file, 1 for the second and so on.
o well i dont think anyone would be stupid to do that if u do add this when a person presses delete it should say "are you sure" so that way u cant acciedently delete ur save u dont have to add this but it would be helpful thats why i disabled saving in settings