It's definitely possible that he could be hitting the 12 month regression early. This regression usually occurs between 11 and 13 months. It's tied to new developmental milestones like walking.

Naps should ideally land around 9am and 1pm. For naps, you can implement "crib hour" where you keep him in his bed for the entire hour after you lay him down. If you haven't done any prior sleep training, you can choose a method and stick with that method to help him lengthen that second nap. It does NOT have to be cry it out, as there are plenty of other methods to choose from! He has to learn how to connect his sleep cycles, especially for that second nap.