As such I would conclude that the Speak with Dead spell cannot be used on a skeleton. But hey, if you want it to work than as the DM you have the power to make it work. A skeleton skull is basically the head bone structure + a jawbone. Whether that is sufficient to constitute a mouth is up to you.
Does speak with Dead need a soul?
[…] the body must be mostly intact to be able to respond. A damaged corpse may be able to give partial answers or partially correct answers, but it must at least have a mouth in order to speak at all. This spell does not affect a corpse that has been turned into an undead creature.
Can you cast speak with Dead on a zombie?
Yes, a dead undead creature can be the target of a Speak With Dead spell.
Can you talk to a dead person in RuneScape?
Speak with Dead. Communication (…) You grant the semblance of life and intelligence to a corpse of your choice within range, allowing it to answer the questions you pose. The corpse must still have a mouth and can’t be undead. The spell fails if the corpse was the target of this spell within the last 10 days.
How to speak with the dead in dungeons and Dragons?
Speak with Dead – Spells – D&D Beyond Dungeons and Dragons (D&D) Fifth Edition (5e) Spell – Speak with Dead – You grant the semblance of life and intelligence to a corpse of your choice with… You grant the semblance of life and intelligence to a corpse of your choice within range, allowing it to answer the questions you pose. T…
What happens when you use speak with dead spells?
This spell doesn’t return the creature’s soul to its body, only its animating spirit. Thus, the corpse can’t learn new information, doesn’t comprehend anything that has happened since it died, and can’t speculate about future events.
Where can I go to talk to the dead?
Mediums are well versed in connecting with spirits of the dead. You can usually contact a medium by searching for one online or in a phone book. If you want to speak to a dead loved one, the medium may ask to meet at your home or may have you come to his or her place of work.
