Okay, so I have Into the Storm and know they have rules for playing Kroot and Orks, but I wanted to know if they had rules for any other xenos races or perhaps some abhumans like Ogryn. Or if theres not an official write-up, is there a good house-ruled one somewhere?

No, there are no rules for xenos/abhumans other than the Ork and Kroot rules. There's a fanmade supplement for Dark Heresy:

http://darkreign40k.com/drjoomla/index.php/new-rules/new-homeworlds/888-ratling-abhuman-home-worlds

Other than that, no.

Thanks for the link

Burn the heretic. Kill the mutant. Purge the unclean.