You can easily tell which one it is. Simply "break" open some parts of the one in Picture 1. If it is mold, it will continue looking moldy-ish. If it is a termite hive, there would be tunnels with termites inside. What made me think of termites is that on Picture 1, the growth has started growing on the wall and mold would normally not do that (mold would stick to developing on the mulched areas).
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