Yes! FRFR-112 cabinets can be daisy-chained using the XLR Output on each speaker. Connect an XLR cable from the output of one cabinet to the input on your second cabinet. This will produce the same mono signal through both cabinets.
Keep in mind, the input level on the second FRFR will still be active so be sure to set this to match the level of the first FRFR.