There is no dedicated statement for ignoring a specific port by name. You may want to try LVS IGNORE TRIVIAL NAMED PORTS YES and see if that helps.
Another approach that might work depending on the connectivity is to eliminate the user name on the floating node. You could try this:
LAYOUT RENAME TEXT "/THERM//" CELL LIST A
LAYOUT CELL LIST A "my_cell_name"
where my_cell_name is the name of the cell with the THERM text object you want to ignore for the time being.
If those methods don't work, maybe provide a layout SPICE netlist excerpt showing the problem and the discrepancy that you're getting in the LVS report.