Who do you have to screw to give birth to a moot baby?
According to the code (51_System_Settings_Cross_Breed):
Human 100%Human
Fishkind 10%Human 10%Deepone 80%Fishkind
Moot 50%Human 50%Moot
Deepone 90%Deepone 10%Human
Orkind 10%Moot 90%Orkind
Goblin 10%Moot 90%Goblin
Abomination 10%Human 10%Moot 80%Abomination
So either a Moot (50%), Orkind (10%), Goblin (10%), or an Abomination (10%).
Edit: Interestingly enough, there is also code for 'CROSS_BREEDING_Deepone' in addition to 'CROSS_BREEDING_Moot' and 'CROSS_BREEDING_Human' (only those 3) so I assume that you can play as Deep One Lona.
Edit 2: Nope, just combed through the picture files and there are not pictures of Deep One Lona, only regular Lona and Moot Lona. Maybe later updates?