The term for more than one police officer is "police officers" or simply "police." In a broader context, the entire law enforcement agency can be referred to as "the police" when discussing the collective group.
you can stab yourself in the heart 5 times. once you do that please call the police and a mental doctor.
more than one lynx is call lynxes
you call them possums if your talking about more than 1
policemen or police which implies more than one
More than one fisherman is fishermen
More than one platypus is two or more platypuses. The plural is not 'platypi'.
Fish
swans
Ants
its just fishermen
Pegasi I think.
Polygamy.