Here is a story about frogs which have the grumpist face expression. The frogs are rain frogs in Africa.
In general they are not sad or angry just this is their appearance. They have a small size about 2 inches length.
They are very impressive frogs because of their black colour and appearance. When these frogs are scared they enlargen their body so that they will look more aggresive.
These frogs lile to stay in the presence of water to live.
These black coloured frogs are like angry avocados. The frogs have a special way of squeeks. They have a habbit of creating tunnels for about 6 inches.
Here is the cute video:
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