"shad frog" meaning in English

{
  "etymology_text": "So called because it usually appears at the time when the shad begin to run in the rivers.",
  "forms": [
    {
      "form": "shad frogs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shad frog (plural shad frogs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Frogs",
          "orig": "en:Frogs",
          "parents": [
            "Anurans",
            "Amphibians",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An American spotted frog (Lithobates pipiens and Lithobates sphenocephalus)."
      ],
      "id": "en-shad_frog-en-noun-GC7kkqr5",
      "links": [
        [
          "Lithobates pipiens",
          "Lithobates pipiens#Translingual"
        ]
      ]
    }
  ],
  "word": "shad frog"
}

{
  "etymology_text": "So called because it usually appears at the time when the shad begin to run in the rivers.",
  "forms": [
    {
      "form": "shad frogs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shad frog (plural shad frogs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "Entries using missing taxonomic name (species)",
        "en:Frogs"
      ],
      "glosses": [
        "An American spotted frog (Lithobates pipiens and Lithobates sphenocephalus)."
      ],
      "links": [
        [
          "Lithobates pipiens",
          "Lithobates pipiens#Translingual"
        ]
      ]
    }
  ],
  "word": "shad frog"
}