This is not dangerous, but taste will be unacceptable. Fruit can be refrozen if taste and smell are acceptable, or it can be used in cooking or for making sweet spreads. Refreeze meat only if it contains ice crystals. When cooked, use in casseroles and similar type dishes to mask any flavor changes. Texture will be affected.
Ice cream has air incorporated into it during the freezing process.
If thawed, the air escapes and refreezing does not result in an acceptable product. In addition, if ice cream has been at an unsafe temperature long enough, food safety may be a problem. If refrozen and cooked, they could be dangerous. Do not try to save these foods. Refreeze partially thawed foods quickly by setting the temperature control of your freezer to the coldest position.