The mighty Vaka, the king of the Karushas, capable of fighting by putting forth his powers of illusion, waiteth, upon Jarasandha, as his disciple. The Karusha king Dantavakra also wait upon Jarasandha the king of Magadha. (2,14)
Chedi king Shishupala, disguising himself in the attire of the king of Karusha, ravished the innocent Bhadra, the princess of Visala, the intended bride of king Karusha. (This Karusha is certainly not Dantavakra, Shishupala's friend). (2,44)
Karusha was also a type of tree (3,111). Karusha region was probably the regions where these trees grew in abundance
Kiratas (hunter-gatherers) armed with cruel weapons and ever engaged in cruel deeds, eating of fruits and roots and attired in skins and living on the northern slopes of the Himavat and on the eastern mountains and in the region of Karusha on the sea-coast (possibly in the sea coast of Bangladesh) and on both sides of the Lohitya mountains (Lohit, Arunachal Pradesh. They brought tribute to Pandava king Yudhishthira.(2,51)
The assembled kings of the Chedi and the Karusha tribes joined the Pandavas with all their resources. (5,22). Karusha army was placed under the general Dhristaketu who was the king of Chedi Kingdom (5,199). The Chedis, Karushas and Kasis were placed under him.