If “eis” is the German word for “ice”, some possible synonyms in English could be “frost”, “glacier”, and “hail”.
“Frost” refers to the thin layer of ice crystals that forms on surfaces when the temperature drops. For example, “The grass was covered in frost in the early morning.” While it is not exactly the same as ice in its solid form, it is related to cold temperatures and the presence of ice-like substances.
“Glacier” is a large mass of ice that moves slowly over land. For instance, “The majestic glacier was a sight to behold.” Glaciers are made up of ice and represent a massive accumulation of it.
“Hail” consists of small balls of ice that fall from the sky during storms. For example, “The hail pelted down on the roof.” Although hail is not a continuous mass like ice, it is still a form of ice.
Another possible synonym could be “icicle”. An icicle is a long, thin piece of ice that hangs from surfaces. For instance, “The icicles sparkled in the sunlight.” It is a specific form of ice that can add to the description of cold environments.