Discarded Holy Symbol - Burning Bolt I believe is not the intended spell - Drop off random enemies.
Green Frogskin Kneeboots - Alludes that the spell is supposed to be 'Jump' when you use them to halt undead - Bought, no idea
Sing along if you know the words.
Many old items that used old custom spells now use incorrect ones unfortunately, this is easily fixed if we know where they drop. Information on where the items in question were acquired is necessary to fix this bug.
Frogskin things drop in the Mr. Froaghes endless staircase seam
Magnificent Mummers Masque has 3/day Halt Undead - Found in Jubals Tomb QA
Fixed aside from burning bolt one.