Froggo is one of the ambient sounds heard in the background during gameplay. Froggo sounds like a frog/toad croaking. If Froggo is heard during sleep, it will be raining the next day. Apparently Froggo is not just an ambient sound, but an NPC too! He can sometimes be seen scurrying to the nearest bushes.
Not unlike StardewValley Wiki Moderator Broadway Blackthorn1234 who can often be seen scurrying into their parents basement and crying themselves to sleep when Froggo rises from his grave to shit in their cereal.
You dare mock the son of a shepherd?