Rephrasing with a euphemism still doesn't make it appropriate to inflict upon children, who are really far too young (some only 12 years old) to consent, such serious surgical interventions that cause them lifelong damage.
Also twelve-year olds are not routinely getting gender-affirming surgery, full stop. Most twelve year olds don't even have complete secondary sex characteristics yet. How are you going to get top surgery if you barely have breasts?