cachou
Concise Oxford English Dictionary © 2008 Oxford University Press:
cachou /ˈkaʃuː, kəˈʃuː/
▶noun (pl. cachous) dated a pleasant-smelling lozenge sucked to mask bad breath.
– origin C16 (in the sense ‘catechu’): from Fr., from Port. cachu, from Malay kacu.
'cachou' also found in these Oxford entries:

