My bf has two greyish small dome bumps on the foreskin of his penis. are they warts? or what else could they be?

Could be: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. He should see his doctor. You should get HPV vaccination. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex.