leather boots, drum, tribe name
鞨 centers on leather items, especially boots, and by extension a drum made with leather. The tribe name is a specific historical reference rather than a core meaning.
鞨 combines 革 (leather) with 曷, which likely contributes the sound. The character is associated with leather boots and a historical tribe name.
Leather 革 on the left, and the right side looks like a person wearing tall boots. Picture sturdy leather boots being pulled on.
For カツ, imagine cutting leather to make boots: cut -> カツ, and the leather is shaped into boots.
Mohe (one of the Tungusic-speaking tribes)