Can 8 year old 's have a snogg?

A snogg is widely used in Britain and the UK to mean 'a kiss'.

It is entirely at the digression of child's caregiver.

Personally, I embrace social greetings (handshake, peck on the cheek) for children as a sign of respect, but I would discourage children from kissing each other on the lips as a sign of affection.