ice up vs frost over

ice up and frost over both are verbs.

Word	Noun	Adjective	Verb	Adverb
ice up	No	No	Yes	No
frost over	No	No	Yes	No

As verbs, ice up and frost over are synonyms defined as:

ice up and frost over: become covered with a layer of ice; of a surface such as a window

Other synonyms of ice up include ice over.

ice up (verb)	frost over (verb)
become covered with a layer of ice; of a surface such as a window	become covered with a layer of ice; of a surface such as a window