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Some things are universal
(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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I think if you poured that from the back of the skull there aren't that many undercuts except around where the jaws meet. Still likely a 2 part mold but nothing overly complicated and putting the seam around where the jaws meets alleviate the undercuts there as well as helps hide the seam.
Or it could be a single metal mold utilizing the size difference after heat change to help release. Still poured from the back which we don't see in the pics.