If high-risk hpv enters the body for the first time can viruses become dormant before the immune system is activated?

Ask as often as you wish. In medicine we are taught to never say never, but I would not consider it likely. HPV is cleared and goes dormant when the body has developed enough natural antibody production to keep any active virus from emerging/spreading. It can and does often stay dormant in select tissues away from direct blood flow unless the immune system falters & allows it to emerge.

Get HPV vaccine and you will not need to concern yourself with theoretical issues. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health!