Yes you can eat watermelon pips or watermelon seeds.
Watermelon pips or watermelon seeds are edible and you can eat them if you want too and the watermelon seeds provide your body with nutrients and minerals and vitamins.
It's not gonna harm you to eat watermelon pips or watermelon seeds.
I don't like to eat them myself though but have swallowed a few watermelon seeds over the years of eating watermelon and nothing had has happened to me.
The watermelon seeds just came out when I pooped.
I prefer to just spit the watermelon seeds out and first remove most of the seeds from watermelon before eating it or serving it.