python-frog

Python bindings for Frog expose Dutch NLP functions such as tagging, lemmatization, named entity recognition, and parsing.

github.com/proycon/python-frog
python-frog homepage screenshot

About python-frog

python-frog provides Python bindings for Frog, a natural language processing suite intended for Dutch. It exposes part-of-speech tagging, lemmatisation, morphological analysis, named entity recognition, shallow parsing, and dependency parsing. The underlying Frog tool is implemented in C++. The bindings require Python 3.6 or higher and are installed with pip. When binary wheels are available for a system, Frog and its dependencies are included, but the language data must be downloaded once with a separate command.

Windows is not supported natively. The source suggests using WSL or Docker containers on Windows. Language detection support requires the libexttextcat package to be installed first. The project is open source, and its pricing is unknown.

Key features

  • Part-of-speech tagging for Dutch text
  • Lemmatisation and morphological analysis
  • Named entity recognition
  • Shallow parsing and dependency parsing
  • Keyword options to turn individual processing steps on or off
  • Docker/OCI container image with Frog and python-frog included
Best for: Python developers who need to process Dutch text with tagging, lemmatisation, named entity recognition, or parsing.
Good for
  • Open source code is available on GitHub
  • Binary wheels can include Frog and its dependencies when available for a system
  • A Docker image is available for running without a local installation
Watch out for
  • Windows is not supported natively and requires WSL or Docker
  • Language data must be downloaded in a separate one-time step after installation
  • If binary wheels are unavailable, Frog must be installed first and the binding is compiled from source

python-frog at a glance

Type
Open-source project
Pricing
Not confirmed. Check the site
Platforms
Linux, macOS, Windows
Open source
Yes · Source code
Language
English
Last checked
Oct 6, 2026 · Online when checked
Listed
Oct 5, 2026

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python-frog FAQ

Does python-frog run on Windows?
Windows is not supported natively. The source suggests using WSL or Docker containers instead.
Is there a Docker image?
Yes. A Docker/OCI container image containing Python, Frog, and python-frog is available as proycon/python-frog. It can also be built from the included Dockerfile.
How do I install the language data?
After installing with pip, run python -c "import frog; frog.installdata()" once. The data is installed to ~/.config/frog.
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