Yeah, Kuo-Toa are fishmen, not toads or frogs ! But then again, Kaluta is a bad artist, everything he draw looks like toads or frogs. That's probably why he was tasked with drawing the Bullywug.
There are two D&D artists that have a very good reputation I quite don't understand: Kaluta and Reynolds. Reynolds don't know that, usually, arms are thinner than legs, and at least thinner than torsos. He also don't know how to draw a foot. Kaluta's pics are always badly colored and their lines makes them look flat.
Other funny hybrids:
Asaatthi: Yet another serpentfolk race.
Trogodon: Crocodilian centaurs with a crocodilian humanoid torso and head on a crocodilian body. CC1
Proud: Leonine centaurs, more animal in appearance than FR's wemic. CC1
Filcher, Frost Ape, Swamp Gobbler: those are not humanoid apes, they are apes with humanoid-level intelligence. CC1
Pestilite: The long awaited bug humanoid. CC2
Slime Reaver: Another froglike humanoid, for those who think bullywugs and sivs should be OGC. CC2
Piscean: Three all-new flavor of fish-like humanoids ! CC2
Kappa: Your turtle humanoids. OA
Nezumi, Slitheren, Rat Host, Wererat (OA, CC1 & CC2, CC2, MM): You can never have too many ratmen. That's why the Manual of the Planes gives you an ECL for the Uridezu (humanoid ratdemon).
Faun: If you thought one goat-humanoid (satyr) was not enough, here's another. Deities & Demigods.
I, for one, am not too worried with the overabundance of "furries". First, I don't feel compelled to place everything in my worlds. Loxo, for example, I will probably never use. But variety is the spice of life. Maybe if I were running a Dragonstar campaign, I would allow potentially everything to exist in the universe, to account for the aliens.
Then, my homebrew's creation myth had powerful divine entities competiting in their design to create the ultimate race. Ape (or Monkey) and Serpent (or Snake) were among the most prolific creators, that's why we have so many human-like race and so many reptilian humanoids, but Bird, Cat, Horse, etc. also created their own design, and then frequently copied other designs that seemed well-done. Ape having come with one of the best idea (two free hands with opposing thumbs), one that he has declined in several variation himself (human, elf, gnome, orc, etc.), it's no wonder he's been plagiarized to death.
In the end, these powerful deities got schizophrenic when the sentient races they made began worshipping them -- but partial aspect of them, not the wholeness. Dwarves worshipped several minor dwarf gods, not Ape. So these powers finally bursted from the strain of the cosmic energy drawn from faith that stirred them apart, and their shards became the minor, petty, constantly warring gods they are today.