Yes, German dialects can vary greatly for example here’s the same sentence “I have an apple.” in different German dialects:

Standard German:

“Ich habe einen Apfel.”

Northern German / Platt:

“Ik hab en Appel.”

Middle German / Saxonian:

" 'sch’habm Abbl." ( 'sch is pronounced like sh)

Southern German / Bavarian & Austrian:

“I hob an Opfü.” (I is pronounced like the single letter E)

The Southern Germans are the ones with the Schwarzenegger accent.