Moneybags are purse-like enemies with coins in them, appearing in more recent games.
Super Mario 64 DS
They appear in Snowman's Land, and are defeated by jumping on them. They are disguised as a coin until Mario, Luigi, Wario, or Yoshi comes near, and then they reveal themselves and flee. They release five coins when defeated.
New Super Mario Bros.
In New Super Mario Bros., they appear in World 5-2 and 6-3. They hop away from Mario in pit-filled areas, hoping that the plumber will fall to his death. Mario can jump on them or hit with fireballs five times, and will spit out a coin each time they are hit. If defeated, they will release a 1-up Mushroom.