Sktime contains a handful of standard tools and models used for time series analysis and machine learning.
Prophet contains one specific model developed by Facebook, which you will not find in Sktime.
You won't ever find something like Prophet in Sktime because it's a "higher level" model than anything in Sktime. The cleverness of Prophet is based largely on its automatic feature engineering, with a linear regression model underneath. Whereas a library like Sktime focuses on implementing specific models like ARIMA, and letting you do your own feature engineering.
Prophet contains one specific model developed by Facebook, which you will not find in Sktime.
You won't ever find something like Prophet in Sktime because it's a "higher level" model than anything in Sktime. The cleverness of Prophet is based largely on its automatic feature engineering, with a linear regression model underneath. Whereas a library like Sktime focuses on implementing specific models like ARIMA, and letting you do your own feature engineering.