The title says it all.
Trump told Bob Woodward that he knew in February that the coronavirus was deadly but decided to actively and consciously deceive the public and not take decisive action to prepare for a deadly pandemic. Had this been a factory, and Trump a factory owner, I suppose that would at a minimum constitute tort and entitle the victims to compensation.1
Let's assume that with better information and adequate government action people would have protected themselves, many infections would have been prevented and the medical response would have been better, preventing many entirely foreseeable deaths.
Do the President's actions constitute a crime, e.g. negligent homicide?
If so, could he be charged while in office, or afterwards? Note that this question is distinct from oft-asked similar questions concerning actions by the President unrelated to his office, like this one: His decisions and actions were made and performed in his official function as President of the United States.
1 There is a lawsuit under way demanding compensation from the Austrian government for its failure to adequately address the outbreak in Ischgl, the ski resort which bootstrapped the European pandemic.