Pumpkin and squash seeds (and peanuts) have a high phosphorous to calcium ratio and should, like seeds and nuts in general, be used as a treat.
You can give raw and unbaked (that's how they are in the wild) but make sure they are fresh. Peanuts are kind of junk food, but it's understandable to want to make use of the squash seeds if you're feeding squash. I would keep mine in the fridge and toss after a week or when they become slimier than regular squash sliminess.
Wilds can have nuts, seeds and peanuts more freely because they have a balanced wild diet and aren't at the increased risk that captive squirrels are for getting Metabolic Bone Disease (fatal if left untreated.) In nature, they may binge on nuts in the fall, but they don't eat them year round. Inside, we give them year round.
This is why diet is everything and people harp about it often