ReconRobotics, which makes throwable scouting robots, has named two Twin Cities executives to its board/ Proto Labs Inc. Chief Operating Officer Don Krantz and Kyle Nelson, CEO of research and development company Adventium Labs, will join Edina-based ReconRobotics' board of directors. They will succeed Dennis Schulstad and Charles Swannack Jr., who are leaving at the end of the year. Krantz has been COO at Proto Labs, a Maple Plain-based quick-turn manufacturer, since 2005. Nelson served as Adventium's…