Can HPV be transferred if a girl gives me a unprotected blowjob?

Extremely unlikely. Oral HPV isn't all that rare, but a lot less common than genital HPV. More important, even in the busiest STD clinics, we virtually never see patients with genital (e.g. penile) warts whose only possible exposures were oral sex. While nobody can say the risk is zero from oral sex, it is extremely rare -- zero for practical purposes. Oral sex can be considered safe sex in regard to HPV.
Yes. Hpv viruses are very common and very easy to transmit from one person to another. Mouths, fingers, sex toys, etc. Can all be potential ways to transmit the virus from one infected person to another.
Possible, not likely. Hpv can be found orally. However that is quite uncommon. Of the girl does have hpv in her oropharynx, then transmission could occur.