baba

drool, dribble; slime; baby alligator, caiman or crocodile

“La chacha lavaba, y mientras lavaba, la baba se le caía.” — The maid washed, and as she washed, she drooled.

From the hypothesized Vulgar Latin *baba (“drooling, infantile talk”), ultimately imitative of children's speech on the pattern of the repeated syllable ba.