Mother Frog
Mother Frog is a nameless female Frog-girl who dwells in the bog and who uses alluring, vaguely hypnotic music to catch the player character's attention. This music soothes the player, enticing them into her arms, but can be resisted if they choose.
Like presumably all frog-girls, she is a monster-girl with a physique that mingles human and frog traits; a human-like face that conceals a three-foot-long, slimy, prehensile tongue, a skin that is two-toned (lime-green and a pale-white underbelly) but adorned with a pattern of yellow and red markings, a feminine frame that has no breasts or even nipples, unusually large hands whose fingers end in broad, circular tips, and a body covered in a constant layer of drug-laden slime. Her large eyes are yellow, but she has pink hair.
If the player chooses to submit themselves to Mother Frog's music, she lures them into the pool where she is hiding, compelling them to strip naked. With the aid of her drug-like slime, she leaves the player euphoric and hallucinating, helpless as she reveals her hugely gravid state and manuevers them so that she can place her pussy against their anus, proceeding to lay her cargo of eggs inside of them. The player awakens an hour later and stumbles back to camp, gravid with a cargo of a dozen frog-girl eggs.
If the player chooses to resist, though, then Mother Frog panics and tries to scramble away, failing because her belly is so heavy with eggs that she can't climb out of her pond, forcing her to apologise and promise not to try and mess with the player. The player can then choose to ask what she wanted, try and teach her a lesson, or simply leave and return to camp.
If the player asks what she wanted, she grumpily explains her exasperation with being so pregnant, and that she was hoping to entice the player to her arms so she could transfer her latest clutch into him or her instead. She notes during her explanation that she becomes pregnant spontaneously, and gets this pregnant very quickly, which is why she was so frustrated with it. She is quick to promise that neither the player nor her children would have been harmed by her actions. After hearing this, the player can either leave and return to camp, or offer to voluntarily carry in either their anus or, if they have one, their vagina.
Choosing to voluntarily carry her eggs anally leads to a slightly different version of the sex scene in which she "impregnates" the player. The ending, where the player awakens gravid and returns to camp, is also slightly altered, with the player noting they feel proud of themselves for trying to help a mother in need.
If the player tries to teach Mother Frog a lesson, though, she lashes out at them with her tongue, smearing its slime across their eyes and leaving them drugged into a stupor, during which time she escapes. The player awakens two hours later, having lost a point of Toughness, and returns to camp.
Apart from the very first time that the player meets Mother Frog, her meetings are all identical and she never seems to recognize the player. She cannot be encountered if the player is currently pregnant with her eggs.
Pregnancy lasts for two days and results in the PC gaining an increase in hip size and anal or vaginal (depending on where they carried) wetness after they deliver.
For the anal birth scene, the player will lay a dozen eggs and hatch out twelve healthy tad-girls, who remain around long enough to be assured that their "mother" is safe and healthy before swimming away, displaying more compassion than Mother Frog does after impregnating them.
The vaginal birth scene, however, is different, with Mother Frog coming to the player and helping them to deliver, as she's unused to her eggs being laid from the host's vagina instead of the anus. She uses her slimy tongue to stimulate their nethers and ensure they are doped up so that they feel no pain during delivery, and is present when the player regains consciousness, presenting her half-a-dozen tadgirls to the player and inviting them to come and carry another batch for her any time before they all swim away home.
Though nothing is said about how or why she falls pregnant in this fashion, it's logical to presume it comes from living in bog-water that has been tainted by demonic chemicals, similar to how the Factory's pollutants have twisted the various life-forms living there.
Mother Frog conceives her eggs asexually, but, when the player gives birth, it's noted that the player does see some resemblance to himself/herself in the tad-girls; it's possible that eggs carried by the player absorb some of the player's genes, making them biologically the "other parent" of her tad-girls. Strangely, this notification of resemblance only happens if the player carries the eggs anally.