WASHINGTON — In an annual Thanksgiving tradition, President Donald Trump used the power of his office Tuesday to save a pair of meaty turkeys from the holiday table. But Trump jokingly warned a 39-pound bird named Peas and a 41-pound companion named Carrots that, while they are free to live, they may still have to answer to Democrats, who assume control of the House in January and have promised to investigate the president’s actions and business dealings. The White House held an online contest to determine which bird should be pardoned.