A convalescing Pope Francis greeted the crowd in St. Peter’s Square on Palm Sunday, wishing more than 20,000 faithful a “good Palm Sunday, a good Holy Week,” in yet another reassuring public sign of his recovery from a life-threatening battle with double pneumonia.

Many in the crowd reached out to touch Francis’ hand or garments as he was brought in a wheelchair down a ramp to the main altar, where he issued his brief greeting into a microphone. The 88-year-old pope was not wearing…