A leapleaf, known internally as a leaper, is a hostile mob found in the Minecraft Dungeons Jungle Awakens DLC that was corrupted by a shard of the orb of dominance.

Behavior:

A leapleaf has four different behaviors. It cannot be stunned by normal attacks, except Shock Powder and any weapon with the Stunning enchantment.

Basic attack:

If a leapleaf is not currently charging or resting, it smashes any nearby targets with one of its arms, dealing notable damage.

Charge After a leapleaf does a chest-pouding animation, it would begin running toward the target.

Heavy attack:

When in melee reach of the target, it leaps foward and smashes the ground, dealing massive damage.

Rest:

After doing this, it may become stunned and rest on the ground for a few seconds.

More info: https://minecraft.fandom.com/wiki/Minecraft_Dungeons:Leapleaf

Photo By 2EZ (MysticFox51)