I have a typical condition in my magento Grouped product. Is it possible to show Custom attribute (color dropdown) of associated product under Grouped products in the front
It's not clear your question but I would give you a small example to get text field, multiple select or drop-down listbox value.
First, we should load the product collection :
load($this->getProduct()->getId(125));
echo $product->getCustomAttribute();
// lets say your custom attributes name is "size" and type is text field
echo $product->getSize();
// lets assume your custom attributes name is "product_size then
echo $product->getProductSize();
// lets assume your attribute type is drop-down, this will get array of attribute options instead of value that you selected
echo $product->getAttributeText(product_size);
// to get drop-down value that you selected
$attribute = $product->getAttributes();
$productSize = $attribute['product_size']->getFrontend()->getValue($product);
let me know if it's not meet your request.