http://iscoresports.com/

I just bought the app and we are in week 4 of the season. Is it possible to enter individual stats from earlier games.

You can manually enter historical cumulative stats by creating a fake game, starting the game, using Misc -> End Game, then from the Game Info screen, tap the stats options and tap any value to override it for your players. If you want to enter pitcher stats, then in the fake game, you must sub each of the pitchers in and have them throw at least one pitch so they show up on the Pitching Stats as well.

I have a similar issue, but I don't have the earlier stats. Is there a way to just record the score?

If you just want the final scores for a game, create the fake game, and create touchdowns / field goals / whatever scoring is necessary for each team just using fake plays (no players assigned). Then use Misc -> End Game to say the game is over. Should take just a couple minutes per game to do.