diff --git a/moto/iot/responses.py b/moto/iot/responses.py
index 8f6f52521..2daec7068 100644
--- a/moto/iot/responses.py
+++ b/moto/iot/responses.py
@@ -581,14 +581,14 @@ class IoTResponse(BaseResponse):
         return json.dumps(dict(principals=principals))
 
     def describe_thing_group(self) -> str:
-        thing_group_name = self._get_param("thingGroupName")
+        thing_group_name = unquote(self.path.split("/thing-groups/")[-1])
         thing_group = self.iot_backend.describe_thing_group(
             thing_group_name=thing_group_name
         )
         return json.dumps(thing_group.to_dict())
 
     def create_thing_group(self) -> str:
-        thing_group_name = self._get_param("thingGroupName")
+        thing_group_name = unquote(self.path.split("/thing-groups/")[-1])
         parent_group_name = self._get_param("parentGroupName")
         thing_group_properties = self._get_param("thingGroupProperties")
         (
@@ -609,7 +609,7 @@ class IoTResponse(BaseResponse):
         )
 
     def delete_thing_group(self) -> str:
-        thing_group_name = self._get_param("thingGroupName")
+        thing_group_name = unquote(self.path.split("/thing-groups/")[-1])
         self.iot_backend.delete_thing_group(thing_group_name=thing_group_name)
         return json.dumps(dict())
 
@@ -632,7 +632,7 @@ class IoTResponse(BaseResponse):
         return json.dumps(dict(thingGroups=rets, nextToken=next_token))
 
     def update_thing_group(self) -> str:
-        thing_group_name = self._get_param("thingGroupName")
+        thing_group_name = unquote(self.path.split("/thing-groups/")[-1])
         thing_group_properties = self._get_param("thingGroupProperties")
         expected_version = self._get_param("expectedVersion")
         version = self.iot_backend.update_thing_group(
diff --git a/tests/test_iot/test_iot_thing_groups.py b/tests/test_iot/test_iot_thing_groups.py
index d69a5b218..6c343ab63 100644
--- a/tests/test_iot/test_iot_thing_groups.py
+++ b/tests/test_iot/test_iot_thing_groups.py
@@ -38,8 +38,8 @@ def generate_thing_group_tree(iot_client, tree_dict, _parent=None):
 
 
 class TestListThingGroup:
-    group_name_1a = "my-group-name-1a"
-    group_name_1b = "my-group-name-1b"
+    group_name_1a = "my-group:name-1a"
+    group_name_1b = "my-group:name-1b"
     group_name_2a = "my-group-name-2a"
     group_name_2b = "my-group-name-2b"
     group_name_3a = "my-group-name-3a"
@@ -112,7 +112,7 @@ class TestListThingGroup:
         client = boto3.client("iot", region_name="ap-northeast-1")
         generate_thing_group_tree(client, self.tree_dict)
         # test
-        resp = client.list_thing_groups(namePrefixFilter="my-group-name-1")
+        resp = client.list_thing_groups(namePrefixFilter="my-group:name-1")
         assert "thingGroups" in resp
         assert len(resp["thingGroups"]) == 2
         resp = client.list_thing_groups(namePrefixFilter="my-group-name-3")
@@ -129,7 +129,7 @@ class TestListThingGroup:
         generate_thing_group_tree(client, self.tree_dict)
         # test
         resp = client.list_thing_groups(
-            namePrefixFilter="my-group-name-1", recursive=False
+            namePrefixFilter="my-group:name-1", recursive=False
         )
         assert "thingGroups" in resp
         assert len(resp["thingGroups"]) == 2
@@ -166,7 +166,7 @@ class TestListThingGroup:
 @mock_iot
 def test_delete_thing_group():
     client = boto3.client("iot", region_name="ap-northeast-1")
-    group_name_1a = "my-group-name-1a"
+    group_name_1a = "my-group:name-1a"
     group_name_2a = "my-group-name-2a"
     tree_dict = {group_name_1a: {group_name_2a: {}}}
     generate_thing_group_tree(client, tree_dict)
@@ -199,8 +199,8 @@ def test_delete_thing_group():
 @mock_iot
 def test_describe_thing_group_metadata_hierarchy():
     client = boto3.client("iot", region_name="ap-northeast-1")
-    group_name_1a = "my-group-name-1a"
-    group_name_1b = "my-group-name-1b"
+    group_name_1a = "my-group:name-1a"
+    group_name_1b = "my-group:name-1b"
     group_name_2a = "my-group-name-2a"
     group_name_2b = "my-group-name-2b"
     group_name_3a = "my-group-name-3a"
@@ -313,7 +313,7 @@ def test_describe_thing_group_metadata_hierarchy():
 @mock_iot
 def test_thing_groups():
     client = boto3.client("iot", region_name="ap-northeast-1")
-    group_name = "my-group-name"
+    group_name = "my-group:name"
 
     # thing group
     thing_group = client.create_thing_group(thingGroupName=group_name)