Acacia are an African group of trees? I think some are a food source for leopards, but from what I've read there are many kinds and some are seasonally avoided by most herbivores.
On the two plants ( one from the OP and one from Hugo's Home ) the mystery one and the desert willow, the quality of the images are good enough to see they are not the same. But darn it all they look really close.
The dang taxonomists have been mucking around and decided that only Australian Acacia are really Acacia , Linnaeus be damned. The African species (of the putative Acacia ) are well known, and with caution, might be used in enclosures for African tortoise species. I would avoid the lot, out of a superabundance of caution.