Is there an App to draw or realize changes in OpenStreetMap ?
Vespucci is a full blow editor.
OsmAnd, a navigation program allows you to make (smaller) changes as well.
StreetComplete has a number of quests that asks to complete missing information such as street names, road surfaces, house numbers, opening hours, etc.
See https://wiki.openstreetmap.org/wiki/Android in the OSM wiki for another oveview of OSM related apps.