diff --git a/dask_expr/_collection.py b/dask_expr/_collection.py
index 1c62e8fc4..0009ed492 100644
--- a/dask_expr/_collection.py
+++ b/dask_expr/_collection.py
@@ -897,10 +897,12 @@ def from_dask_dataframe(ddf: _Frame, optimize: bool = True) -> FrameBase:
     return from_graph(graph, ddf._meta, ddf.divisions, ddf._name)
 
 
-def read_csv(*args, **kwargs):
+def read_csv(path, *args, **kwargs):
     from dask_expr.io.csv import ReadCSV
 
-    return new_collection(ReadCSV(*args, **kwargs))
+    if not isinstance(path, str):
+        path = stringify_path(path)
+    return new_collection(ReadCSV(path, *args, **kwargs))
 
 
 def read_parquet(
@@ -923,7 +925,7 @@ def read_parquet(
 ):
     from dask_expr.io.parquet import ReadParquet
 
-    if hasattr(path, "name"):
+    if not isinstance(path, str):
         path = stringify_path(path)
 
     kwargs["dtype_backend"] = dtype_backend
diff --git a/dask_expr/_expr.py b/dask_expr/_expr.py
index bdc710d0d..b32f4487b 100644
--- a/dask_expr/_expr.py
+++ b/dask_expr/_expr.py
@@ -10,7 +10,7 @@
 import dask
 import pandas as pd
 import toolz
-from dask.base import normalize_token, tokenize
+from dask.base import normalize_token
 from dask.core import flatten, ishashable
 from dask.dataframe import methods
 from dask.dataframe.core import (
@@ -27,6 +27,8 @@
 from dask.utils import M, apply, funcname, import_required, is_arraylike
 from tlz import merge_sorted, unique
 
+from dask_expr._util import _tokenize_deterministic
+
 replacement_rules = []
 
 no_default = "__no_default__"
@@ -530,7 +532,9 @@ def npartitions(self):
 
     @functools.cached_property
     def _name(self):
-        return funcname(type(self)).lower() + "-" + tokenize(*self.operands)
+        return (
+            funcname(type(self)).lower() + "-" + _tokenize_deterministic(*self.operands)
+        )
 
     @property
     def columns(self) -> list:
@@ -836,7 +840,7 @@ def _name(self):
             head = funcname(self.operation)
         else:
             head = funcname(type(self)).lower()
-        return head + "-" + tokenize(*self.operands)
+        return head + "-" + _tokenize_deterministic(*self.operands)
 
     def _blockwise_arg(self, arg, i):
         """Return a Blockwise-task argument"""
@@ -2025,7 +2029,7 @@ def __str__(self):
 
     @functools.cached_property
     def _name(self):
-        return f"{str(self)}-{tokenize(self.exprs)}"
+        return f"{str(self)}-{_tokenize_deterministic(self.exprs)}"
 
     def _divisions(self):
         return self.exprs[0]._divisions()
diff --git a/dask_expr/_util.py b/dask_expr/_util.py
index a206fa9ad..6275e3769 100644
--- a/dask_expr/_util.py
+++ b/dask_expr/_util.py
@@ -1,5 +1,10 @@
 from __future__ import annotations
 
+from types import LambdaType
+
+from dask import config
+from dask.base import normalize_token, tokenize
+
 
 def _convert_to_list(column) -> list | None:
     if column is None or isinstance(column, list):
@@ -11,3 +16,14 @@ def _convert_to_list(column) -> list | None:
     else:
         column = [column]
     return column
+
+
+@normalize_token.register(LambdaType)
+def _normalize_lambda(func):
+    return str(func)
+
+
+def _tokenize_deterministic(*args, **kwargs):
+    # Utility to be strict about deterministic tokens
+    with config.set({"tokenize.ensure-deterministic": True}):
+        return tokenize(*args, **kwargs)