These Level 1s kill one stinkin' OGRE without taking a single hit and all of a sudden they think we're playing 5e, or something...
I'm not going to give you any clues or help you out in any way, and a TPK is possible here, but I will say I'm not 100% convinced you're out of this fight yet. It could go south, for sure (I mean more south that it has already), but some smart tactics and some dice swinging the other way and you can very well be back in this, knowing what I know on the back end of this DM Screen.
The three attacks, with every success forcing a Saving Roll is hurting you guys pretty badly, but if you look at those die rolls, these ghouls have been throwing a lot of natty-20s, 19s, 18s... Those things are gonna get damage past even your most heavily armored PCs...
I don't know. Could be a cleanout... But you could walk away from this fight alive (at least some of you...)