It's from the Pixar short Partly Cloudy. I'm not sure if they have a name however.
quick google search got me to the official site. according to the site, the cloud is named gus and the stork is named peck. not sure. no idea on the 3rd one. could be from something else all together http://www.pixar.com/short_films/Theatrical-Shorts/Partly-Cloudy
Eh~A pink cloudUnzan
nyuudou
Sometimes will transform into a cloud while resting in the skyWas it created by Discord?You haven't learned how to make clouds rain at your age? Here, I'll teach you: Just softly step on one.Seems that she brought friends today.Where did you go today, and why is your expression so disgusting?Pink CloudSo soft~Pink CloudWhich cute ponies will they be?I told you to be soft!See, this is the pink cloud I was talking aboutUnzan!!
