Does anyone know anything about gardening?

Probably. I'd dry them out first - fresh ones might rot?

Can you plant pumpkin seeds fresh from a pumpkin?

A friend just gave us a massive Crown Prince and I’d like to save and plant the seeds.

Squash are notoriously promiscuous so if your Crown Prince was grown around other squash plants you may not get a true Crown Prince but some sort of hybrid ... worth a go though.

And dry the seeds first as rhowe says .

A friend just gave us a massive Crown Prince and I’d like to save and plant the seeds.

Was it homegrown and non F1 hybrid? Most stuff you buy in the shops are F1 hybrids and will grow a big plant but are sterile and won’t set any fruit. If it’s a non hybrid then it will grow fruit but will need a lot of space and feeding and as @not4sale says the fruit may be a cross with any squash, pumpkins, courgette, melon etc in the vicinity of the original plant.