TokHaar-Jad has the same attacks as TzTok-Jad and as with TzTok, the damage from these can be completely blocked by watching the attack animations and switching to the correct protection prayer in time. However, it is worth noting that if you make a mistake, then the TokHaar's attacks are much more powerful.
Furthermore, the Fight Kiln features a total of 7 TokHaar-Jads which appear on wave 10, 20, 30, 34, 35 and 36 along with other TokHaar monsters. However, there is a way to defeat them all rather simply and that is to position yourself at the northeast corner of the rock in the middle of the kiln at the start of the applicable waves and wait for them to spawn and get stuck on the rock as they do not attack you over it. You can then focus on and kill Jad on its own without having to worry about being attacked by anything else, including the second TokHaar-Jad on wave 36.