"The squirrels are thinking about food."

Translation: Egernene tænker på mad.

[spiffwalker]

Why is this på and not om here?

[tddk]

No logic really, just tradition. Danes think on/"på" something, not about/"om" something.
I see that you are also studying german so you know that germans think over/"über" something.

[SuzannaWaldorff]

Hedder det ikke bare : egerne ?? jeg har aldrig hørt egerNENE

[RyagonIV]

Squirrel: egern - egernet - egern - egernene eller egernerne
Spoke: eger (eller ege) - egeren (eller egen) - eger - egerne

[OleRix1]

da.m.wiktionary.org:
egern egernet egern egerne(r)ne
Pronounced:eger'ne'ne