This 100%. The baby Pokémon mechanism was a flop in the TCG, but after that they never changed it so all these cute Pokémon are almost without released cards. @pichufan made this list of the last Japanese card release of gen 1 and 2 Pokémon, where a lot of the baby Pokémon are at the top, along with Abra and Kadabra due to that lawsuit that’s finally gone now since last year. And the baby Pokémon of later gens weren’t any better of. Mantyke only has three artworks, of which just one in English; Budew has two; etc.
Some others that come to mind: Tirtouga/Carracosta and Archen/Archeops; Phione (always in the shadows of Manaphy); Torterra (my personal favorite grass starter); Porygon evolution line (primarily in the anime, since Porygon 2 and Porygon-Z have never been shown only because of that epileptic Porygon episode back in the day…); Quilava; Paras/Parasect; Venonat/Venomoth; Tangela; Chingling.
Greetz,
Quuador