One name for someone who likes to talk a lot is "chatterbox". An adjective for someone who likes to talk a lot would be "gossipy".
you call them bitefull
belligerent
a traveller...
a geologist
Pyromaniac.
geek
a traveller...
sharp
There is no special name for a person who likes squirrels.
How about a "gun enthusiast"?
a troublemaker?