They do not seem like Naga/Hill Tribe beads at all.

In Africa, I can think of very few significant makers of ceramic beads. An exception is Morocco—where well-fused clay beads have been made, that imitate other desired materials, such a amazonite. (Though in a variety of colors.)

I wonder if they could be some paste material (?). These are also made in Morocco and Mauritania, and some were made to imitate amber.

Have you checked their hardness? JDA.

A metal saw produces yellow powder. In fact, there are deep string grooves on some beads. But a hot needle barely penetrates.

I had some beads like this a few years ago, They are made of some type of paste to look like amber. They came from West Africa.
Judy

I have 2 or 3 colors I bought from traders.
Mine are all round, they are very hard, opaque, as heavy as glass, not as hefty as stone.
I have pink (yup!), brownish, etc.
I have some other strands, sort of drum-shaped that are white speckled with black particles. They look like someone mixed a compound of white granules with a few black granules, then shaped them.
Almost like somebody is trying to imitate stone rather than glass. "Resin" comes to mind, but I don't know why.
I'll try to take some pics of them tomorrow.

illustrated on page 25 of my book "Beads ...a collector's guide" i show a range of modelled beads in different colours made of some kind of pottery formula and then coloured to resemble coral, ammonite, turquoise, jasper etc. which are often used on relatively recent necklaces in the Moroccan style... and on page 63 many lookalike amber beads are shown, amongst them at least one of your type...