>>50282947>and doesn't really resemble any sort of animalIt's a fucking sauropod, one of the most well-known dino families with triceratops and raptors.
>Bayleef and Meganium just look like different forms of the same pokemonThis is a common them among johto starters and Feraligatr is the worst offender as it has neither a drastic personality change like Typhlosion or a noticeable design change like Meganium.
The true reason why Chikorita's line lagged behind the other starters is that the final form wasn't badass enough to appeal to young boys, the vast majority of the game players at the time. And since it wasn't chilled by the anime as much as some other cute mons like Pikachu it fell into relative unpopularity.