You are looking for Mushroom Bubblers
https://www.amazon.com/20-Pack-Pattern-Mushroom-Sprinkler/dp/B00LOR7EXY/ref=sr_1_5?keywords=bubbler+irrigation&qid=1568300138&s=gateway&sr=8-5
https://www.homedepot.com/p/Plastic-Mushroom-Bubbler-54119/100124673