The Grateful Frog is one of the many harvestables that can be obtained in the Frontier. They are considered to be one of the most sought-after harvestables by most parts of the community as it is an item of importance used to complete the Frog Quest, in exchange with rare collectibles.
Grateful Frogs are usually found hanging underneath terrains, objects, trees, and props that are found across the lands of the Frontier. They are found in various locations of the Frontier that includes but not limited to:
Despite its rare spawn-points (occurences), the Grateful Frog can also be acquired via killing Purple Ogres, Ogres, and/or Red Ogres as a rare drop from the mobs.
The Grateful Frog appears to be a green frog humanoid-like figure that is trapped in an iron cage. Above the cage is a hook where the cage is hooked and/or attached on an object, terrain, and/or props that can be found in the Frontier.
List of Locations
These are the known locations of the Grateful Frog. It varies from multiple places and not all known spawns are known to the public. These Grateful Frogs are often found hanging underneath something, so be sure to find one.
Underneath the tree near the graveyard, except it's in a different position.
Video Footage(s)
If you prefer video footages to understand and know where these Grateful Frogs tend to be found at, click or press this video to start watching discord user ExtremeNinja777's (fantastic) video about how to farm Grateful Frogs. This video is explained well to allow beginner players to understand and for the dedicated, experienced players to keep in mind.
Trivia
It is typically recommended for players to acquire a Spider Stilts, Jump Boots, Mushroom Parasol, Wings, and/or Minion to acquire the Grateful Frog as most of its spawn-points are considered to be impossible to acquire without proper equipment.
The Grateful Frog is often collected to be used as a way to exchange rewards with the Blue Frog during the Frog Quest.
The Grateful Frog is not to be confused with the Blue Frog as both of these NPCs is trapped in a cage and appears to be the same specimens.
Rather than seeing [E] Harvest, the player will see [E] Rescue, as implied by its description where the Grateful Frog is "saved" by the players until eventually they are sold to a selling vendor or turned in to the Blue Frog.