Hello, the origin of kaiju is japanese. So I would stay with japanese terms.
Tsi-Hu also sound japanese. Couldn't find a direct translation for Tsi (
https://en.wiktionary.org/wiki/ツィ) or Hu.
As for the anklebiters/kneebiters
(Englisch Word) = (japanese pronunciation), if i get google-translate right.
ankle = Nakkaru
knee = Shiza
bite = Kamu
death = Shi
hunter = Ryōshi
basely = Kihontekini
low = Hikui
keen = Surudoi
So maybe a combination/alteration of those words
Nakka-Shi
Shiza-Kamu, Shiza-Kam
Hikui-Shi
Shi-Kamu