Yes, you see those "congita" , conguitas etc. all of the time at ebay, I call them bonsai drums always
I donĀ“t like them at all, their sound is not neither fish nor flesh, in other words:
either you want to play (a "real") conga, or you wnat to play bongos (technique is different!).
In my personal opinion these instruments just fill a marketing gap.
Just my point of view, though, others might feel different about them.
Mike