The Missing Mammoth

The Mystery of the Missing Mammoth debuted 23 August 2019. It is s2e17

http://archive.is/tRL9p

9:00 AM Addison (HD) - Series 2 - Eps 17 - The Mystery of the Missing Mammoth Ms. Bell has planned to surprise her students by hiding mammoth fossils in the school sandpit for them to dig up. But the surprise is on Ms. Bell and her students when the fossils disappear - and Addison has to figure out where they went.

It listed the debut date strangely as 10 February 2020 where it debuted as merely The Missing Mammoth.

Donnie names his rocks.