Dr. Finnius is Frogger's Grandpa and was as the first appearance game Frogger's Journey: The Forgotten Relic.
Frogger: Ancient Shadow Edit
He is first mentioned in the intro cutscene when Frogger said he left a note at his house. This was a response to Lily asking if Frogger had seen him recently.
He is the only frog character not playable in Minigame mode in Frogger: Ancient Shadow.