"momo" can refer to a number of artists, characters, and other things. Check the current list of momo_* tags to see if there is a more specific one that fits what you are trying to tag.

Some of the more popular tags from that list include...

Artists

• momo_92698
• momo_fox

Characters

• momo_(google)
• momo_(dagasi)
• momo_(doodle_dip)
• momo_(creepypasta)
• momo_yaoyorozu
• momo_(avatar)
• momo_(mymyamoo)
• momo_(momorodent)
• momo_(sy_noon)
• momo_(kiichi)
• momo_(monarquis)
• momo_(nekowife)
• momo_softpaw
• momo_(sirbrownbear)
• momo_(aruurara)
• momo_(sub-res)
• momo_(characters)
• momo_(breath_of_fire)
• momo_(momomeow)
• momo_(pokemon)
• momo_(ultra_nyan)

...but check the complete list if the one you want isn't listed here.