Local Control trainee reported a small aircraft landed and was smoking. The trainee sent another aircraft around and provided assistance to the aircraft that was smoking.

Narrative

I was Local Control; training in progress. Weather VFR. Ground was split off; Controller in Charge was standalone. Aircraft X was in left traffic for Runway 19 and had been cleared for the option on Runway 19 and told they were inside of Aircraft Y. Aircraft X indicated they would be a full stop. Aircraft Y was cleared for the option number 2. Aircraft X landed and I was giving turn and taxi instructions when I and my trainer noticed the aircraft was smoking and had rolled into the intersection of Runway 19 and Runway 7/25. The Controller in Charge was alert to the situation and pulled the crash phone. I sent Aircraft Y around and gave him his VFR departure clearance. I asked Aircraft X if he required assistance. He informed me that they had flamed out and there was smoke; but the flames were out and they were fine. I informed him that Airport Operations was on the on the way. Operations and ARFF (Aircraft Rescue and Firefighting) arrived quickly. Both runways were closed and the aircraft required a tow back to the hangars. A FOD sweep was conducted after the aircraft was towed off the runways and taxiways.