Based on the provided information, there are two possible three-letter words that could fit the description of "hoog gras":
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Riet (https://en.wikipedia.org/wiki/Real_estate_investment_trust): This refers to a tall, reed-like grass that grows in wet areas, such as marshes and ponds.
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Gras (https://nl.wikipedia.org/wiki/Gras): While this is a general term for grass, it can also be used specifically to refer to tall grass, especially in the context of meadows or pastures.
Without more context, it is impossible to determine which of these two words is the correct answer. However, both "riet" and "gras" are valid Dutch words that could be used to describe tall grass.