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