If you mean apps to use in your development, yes, there are many commercial and pretty good tools like AppSee, Heatmaps.io and so on. I don't know and I doubt there's anything free other than free trials for those commercial apps.
If you mean research, there's a lot scattered around the web. The old and classic mobile UX research by Mozilla is always a good place to start
Now, based in my particular experience and testing, there's not such thing as an F pattern in mobile, and that's because space is really limited and placement of elements will determine the heatmap at first sight.
In general, and again, BASED ON MY OWN RESEARCH, there's a tendency to scan top and then center if you use a flat design with very simple elements, but if you use pictures with people, the position of the main character's head/face will draw the first eye contact. For us, this was (is) very useful to place CTAs, since most of my work is about sales and CTR, but maybe it will help you, so there you go.
Finally, keep in mind you'll need to consider whether you're building a mobile app or you're building a responsive web page, since approaches will vary enormously (obviously, you won't have limitations in a mobile app and you'll have some limits in a webpage, and you'll need to consider heatmaps for all device sizes)