Not necessarily, many small breeds make funny sounds when exciting. It is sometimes called reverse-sneezing.
BTW there is no such thing as a teacup anything, teacup is just a descriptive term breeders use. "Teacups" are no different from a normal sized pomeranian except they are bred from smaller and smaller dogs and can sometimes have many health issues.
So glad you rescued a dog! So many shelters are overcrowded these days.