If you are (rare) hunting for Irradiated Roach
or Fluxfire Feline
, there is a fairly quick and easy way to go about it. Instead of camping New Tinker Town on your home server, simply roll a new Gnome on a Low Pop/Brazillian/PvP/Role Playing server and look around your starting zone and the surface of New Tinker Town with your L1 Gnome for these wild pets. If you don't find what you are looking for after you've scoped out each of the pets in the zone, don't bother camping, just repeat the process on another server.
P.S. Note that all of Dun Morogh is Alliance held and so any Horde players present cannot attack you unless you first attack them.