Hey Clara,
I’m no expert but at this age, I usually refer to their body parts as is. So I don’t use pseudonyms or anything. Also I’m not into body shaming - so we try not to use words like fat, and big. Affirming them of their bodies helps them to be body confident and proud of what they’re blessed with. I believe that with this foundation, when you have the birds and bees talk much later, they tend to have more respect for their own bodies and value privacy.