No they can't, and they won't, unless you want the fed to crash the dollar and make it worthless. The money supply is a very tricky thing in that you want enough liquidity so that the market continues working, but too much money supply would make the dollar as worthless as seashells.
Sure, but what is the number that constitutes "too much"? Right now the M3 money supply is 15.3 trillion dollars and the CPI inflation has been below 4 percent since 1991. In that period the money supply has grown by 12 trillion. If quintupling the money supply in the same period that GDP only doubled doesn't not only not tank the value of the dollar but doesn't even cause serious inflation, I'm curious what would?
That's a serious question, by the way - I have a background in economics. This is unprecedented.
[0] https://www.cnbc.com/2017/11/24/the-fed-launched-qe-nine-yea...