All of the following except for Thurl Merosska have the correct HP bonuses in the source books but typos in DnDAppFiles. I found them by writing a tiny script to scan the Bestiary Compendium and print out creature details where the HP bonus was not equal to _Hit_Dice * CONBonus, then looked them up in the source books.
Cloud Giant Smiling One, Volo's Guide p. 146. HP is listed as "262 (21d12+128)", should be +126 (CON bonus of +6 times 21 Hit Dice)
Dragon Turtle, MM p.119. HP is "341 (22d20+10)", should be +110 (CON bonus of +5 times 22 Hit Dice)
Thurl Merosska, from Princes of the Apocalypse, p 146. There are 2 problems here.
The first is that DnDAppFiles says he's from Tyranny of Dragons instead of PotA.
The second is that HP is listed as "71 (11d8+21)" but should be +22 (CON bonus of +2 times 11 Hit Dice).
That seems to be a typo on PotA p.146, copied accurately - the HP total of 71 is correctly calculated as if the bonus were +22: average of 11d8 is 49, +22 = 71.
Ulitharid, Volo's Guide p. 175. HP is listed as "127 (17d10+14)", should be +34 (CON bonus of +2 times 17 Hit Dice).
All of the following except for Thurl Merosska have the correct HP bonuses in the source books but typos in DnDAppFiles. I found them by writing a tiny script to scan the Bestiary Compendium and print out creature details where the HP bonus was not equal to _Hit_Dice * CONBonus, then looked them up in the source books.
Cloud Giant Smiling One, Volo's Guide p. 146. HP is listed as "262 (21d12+128)", should be +126 (CON bonus of +6 times 21 Hit Dice)
Dragon Turtle, MM p.119. HP is "341 (22d20+10)", should be +110 (CON bonus of +5 times 22 Hit Dice)
Thurl Merosska, from Princes of the Apocalypse, p 146. There are 2 problems here.
The first is that DnDAppFiles says he's from Tyranny of Dragons instead of PotA.
The second is that HP is listed as "71 (11d8+21)" but should be +22 (CON bonus of +2 times 11 Hit Dice).
That seems to be a typo on PotA p.146, copied accurately - the HP total of 71 is correctly calculated as if the bonus were +22: average of 11d8 is 49, +22 = 71.
Ulitharid, Volo's Guide p. 175. HP is listed as "127 (17d10+14)", should be +34 (CON bonus of +2 times 17 Hit Dice).