Hong Kong toymaker Jeffrey Lam Kin-fung is feeling the pressure from US President Donald Trump’s import tariffs, even though his products are not yet subject to any duties.His company, Forward Winsome Industries, a pioneer in the manufacture of rubber ducks, has been rushing to meet a spike in orders from American customers keen to stockpile products before they are hit by the next round of tariffs.On May 5, Trump said on Twitter that his administration would extend punitive 25 per cent duties…