The plural of buffalo is buffalo, buffaloes or buffalos. The preference is for buffalo.
Latches.
daddies.
Clouds
circus's
slides
axes
That is the correct spelling "princesses" for more than one princess.
I think perhaps you are trying to spell countries, as in more than one country.
Trophies
spell it out - there is more than one ADEA
One activist. Several activists.
More than one blog=blogs.