Snapchat just sucks. The photo quality is terrible compared to just using the stock camera app

One trick I just found when searching online was to zoom in a little. This depends on which app your using and how it's built. I tested a few apps on Android. Google Photos and Google Messages successfully locked from scrolling after zooming in slightly. On Samsung Gallery zooming in slightly helped prevent accidental swipes however if already scrolled to one side and another swipe gesture thats long enough comes around it'll still scroll