Gobblin is an enemy in Yoshi's Island DS. It's a large, yellow, smiley face balls with one pink cheek. Unlike most enemies, they do hurt Yoshi if he touches one, instead bouncing him up or back. However, they are always seen blocking Warp Pipes, making them necessary to defeat them to gain access to the pipes.
To defeat it, Yoshi must throw eggs at the Gobblin, which it proceeds to eat, growing bigger with every egg. After five eggs have been fed, the Gobblin will start to look sick, at which point one more egg is needed to defeat it.