You could use some sounds from the orc/bugbear battles (weapons, etc) but for some additional sounds of spooky and weird, I recommend the Sub-Terra set from the Sci-Fi player. That has some great cave atmosphere, uneasy sounds, and some odd vocalizations. The Choker Battle from the Fantasy player also has some good sounds too!
For the krenshar - try the Trouble in Kintargo set from Turn of the Torrent from Hell’s Rebels, specifically the Gorefangs battle mood. And then I would use some horror stings from Elements - Horror when the krenshar does its weird face-skinning fear attack.
Dire Boar - you want the set The Scab from Descent into Avernus, specifically the element “nalfeshnee” or even the whole Nalfeshnee battle mood, as nalfeshnee demons are pig-faced demons, so their sounds are those of angry boars. Combine those with some of the ripping sounds from Tiger Battle (for tusk/gore attacks) and you should be golden.
For the dire weasels, how about the Giant Rat battle? That is some great rodent squealing in rage, along with bites, etc.
