Do-Drop

Do-Drops, also known as Raindrops or Water Droplets, are a species of rain droplet creatures in Yoshi's Story. Their name is a pun on "," a small drop of. Do-Drops first appear in the Jelly Pipe. They are usually found in narrow passageways, where they come out of a broken rusty Pipe. They have a unappealing taste, and as such, a Yoshi will receive damage if they eat one. Because Do-Drops are a liquid-based entity, eating one will not produce an egg. Do-Drops are later found in Shy Guy Limbo, where they are dropped by clouds. They attack by bouncing off and colliding with any Yoshi in sight, dissolving themselves in the process.

Profiles and statistics
When it dribbles down, it's a sudden chill?!
 * Shogakukan guide: ポタッとたれたら、思 わずヒヤリ?!

Trivia

 * While the official Shogakukan guide implies Do-Drops are made of, the Player's Guide associates their unappetizing taste to them being made of.