Yes, you heard it right! Your apps and app ideas can be patented, with the only condition being to meet the eligibility criteria of novelty. However, please note that the app code cannot be patented, as it falls under the category of law covered by copyrights.
Patent application forms can be found on the USPTO website. All of the forms related to patent applications can be found on the link here, or by navigating to the USPTO website and clicking on the “Forms” link under the “Apply for a Patent” section on the “Patents” page.