As far as I can see they are called "beater-in". Here are some extracts from the book "Studies in Primitive Looms" by H. Ling Roth, reprint 1977. They seem to have been a universal form - the last drawing is of a Borneo loom.
If you look at the edge of the wood, you might see numerous small indentations, where they hit the threads.
Regards.
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