I can't find those two creatures:
I want to get their achievements. Where can I find them?
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Using the image below as a reference:
They can be found in Chapter 5, inside the house marked as 4:
blow random hornes while you get a snail head. Than blow the bottom horn while you get the complete creature.
blow random hornes while you get a frog head. Than blow once the bottom horn and once the top horn.
Source: jayisgames.com Walkthrough
For more detailed information on this particular location, see the following question: