Regarding your question about Gopala; yes, Krishna can do anything, that is the principle.
Gopala (Letters)
Expressions researched:
"Gopal"
|"Gopala"
Notes from the compiler:
This is for the name Gopal when referring to Krsna.
Correspondence
1968 Correspondence
1969 Correspondence
Letter to Mahapurusa -- Los Angeles 25 January, 1969:
Regarding your second question, the other names of Krishna which you have mentioned, such as Gopala and Govinda are as powerful as the name Krishna.
1970 Correspondence
Letter to Ksirodakasayi -- Los Angeles 10 January, 1970:
Regarding your Tuesday class at your place, you can continue it as a sub-branch of ISKCON Radha Krishna Temple. The procedure should be exclusively for chanting Hare Krishna mantra or singing other songs just like Govinda jaya jaya, Gopala jaya jaya . . ., and nothing more.