No, if you are traveling from the Netherlands to Germany, you usually do not need a travel adapter. Germany uses the same type of socket as the Netherlands, namely the European C-type. This type of socket has two round pins and is standard in many European countries, including the Netherlands and Germany.

You can therefore directly connect your electronic devices to the sockets in Germany without using a travel adapter. The voltage and frequency of electricity in Germany are also the same as in the Netherlands (220-240 volts, 50 Hz).

However, it is always wise to check the specific socket types and requirements of your destination before departure, as there may be variations in some exceptional cases. For example, in older buildings in Germany, it may still be the case that older socket types like the F-type (Schuko) are used. But generally, a travel adapter is not needed when traveling from the Netherlands to Germany.