This sounds easy, have you tried importing this private key in for instance Coinomi wallet?
No i haven't tried. Never used Coinomi wallet.
Do you think i would be able to transfer them with no need of passphrase?
It depends how you created the paper wallet. If it has a private key QR-code, it could be as easy as installing
Coinomi, selecting Dogecoin, and Importing the key.
Depending on the amount (considering Dogecoin's rediculous value) you may want to use something more secure than an online Android phone, but that's up to you
