Thank you! Are you playing on a browser that deletes the cache/cookies every session?
Mamu: Requires a Tier 3 Nest in the village, you need to do something you wouldn't normally do. Its tangentially related to cold. You will know if you did the right thing as soon as you go to the team select screen.
Nessa: Requires a specific egg from egg sense. Is related to birds. You need to take it to a specific non-random tile thats tangentially related to warmth and choose an option that would take some time. Cannot be done in zone 1 but does not require endless mode.
Let me know if you need any more! Theyre very obtuse to get.