Giraffe and for n, Naked mole rat. I know a lot more, but I'll only give you one for each. Hopefully my answer helped.
=D,
C&P
nonevernot now
A four-legged animal that starts with "n" is a newt.
gasel
Gorilla
A four letter word that starts with g and ends with n is gown :)
newt
Newt.
Gull
An animal that lives in the Amazon and its name starts with an N are night monkey. The night monkey is sometimes called an owl monkey.
One animal that lives in the rainforest and starts with the letter "N" is the Nighthawk, a bird known for its nocturnal habits.
Groundhog is a living animal. Another animal is a guinea pig.
For the letter G you could do games and for n you could do nativism